Does a neutral dimercury molecule exist?












10












$begingroup$


Is a neutral $ce{Hg2}$ molecule possible, as a gas under extremely low (partial) pressures? What is the enthalpy of formation or similar?



It is my impression that usual mercury vapors are monatomic? I think it is well-known that a dimer ion $ce{Hg2^{2+}}$ exists under some conditions.



Somewhat related threads: Is it possible to have a diatomic molecule of sodium in gaseous state? and Which elements can be diatomic?






bond molecular-orbital-theory allotropes







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Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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$endgroup$

















    10












    $begingroup$


    Is a neutral $ce{Hg2}$ molecule possible, as a gas under extremely low (partial) pressures? What is the enthalpy of formation or similar?



    It is my impression that usual mercury vapors are monatomic? I think it is well-known that a dimer ion $ce{Hg2^{2+}}$ exists under some conditions.



    Somewhat related threads: Is it possible to have a diatomic molecule of sodium in gaseous state? and Which elements can be diatomic?






    bond molecular-orbital-theory allotropes







    share|improve this question







    New contributor




    Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.







    $endgroup$















      10












      10








      10





      $begingroup$


      Is a neutral $ce{Hg2}$ molecule possible, as a gas under extremely low (partial) pressures? What is the enthalpy of formation or similar?



      It is my impression that usual mercury vapors are monatomic? I think it is well-known that a dimer ion $ce{Hg2^{2+}}$ exists under some conditions.



      Somewhat related threads: Is it possible to have a diatomic molecule of sodium in gaseous state? and Which elements can be diatomic?






      bond molecular-orbital-theory allotropes







      share|improve this question







      New contributor




      Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.







      $endgroup$




      Is a neutral $ce{Hg2}$ molecule possible, as a gas under extremely low (partial) pressures? What is the enthalpy of formation or similar?



      It is my impression that usual mercury vapors are monatomic? I think it is well-known that a dimer ion $ce{Hg2^{2+}}$ exists under some conditions.



      Somewhat related threads: Is it possible to have a diatomic molecule of sodium in gaseous state? and Which elements can be diatomic?






      bond molecular-orbital-theory allotropes




      bond molecular-orbital-theory allotropes






      share|improve this question







      New contributor




      Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question






      New contributor




      Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked 6 hours ago









      Jeppe Stig NielsenJeppe Stig Nielsen

      1513




      1513




      New contributor




      Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      New contributor





      Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Jeppe Stig Nielsen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















          3 Answers
          3






          active

          oldest

          votes


















          8












          $begingroup$

          There has been recent research on mercury dimers in its ground state. Bond energies, transition energies, band spectrum and other parameters has been calculated spectroscopically. Here are the abstracts of two papers on mercury dimer:





          1. The potential energy curve of the ground electronic state of the Hg dimer has been calculated using the CCSD(T) procedure and relativistic effective core potentials. The calculated binding energy (0.047 eV) and equilibrium separation (3.72 Å) are in excellent agreement with experiment. A variety of properties, including the second virial coefficient, rotational and vibrational spectroscopic constants, and vibrational energy levels, have been calculated using this interatomic potential and agreement with experiment is good overall.(Source)




          2. The mercury dimer is among the most weakly bound metal dimers and has been extensively studied. The ground state $ce{O^+_g}$ dissociation energy has been considered to lie between 0.55 eV (440 cm−1) and 0.091 eV (730 cm−1). We report here a spectroscopic study of $ce{Hg2}$ in a supersonic jet. The first optical transition, $ce{1_u←O^+_g}$, was characterized by its fluorescence excitation spectrum and the binding energy of the ground state has been measured precisely through the threshold of collision induced dissociation of $ce{Hg2 1_u}$ to $ce{Hg(^1S_0)+Hg(^3P_0)}$.(Source)








          share|improve this answer









          $endgroup$













          • $begingroup$
            What does "has been calculated spectroscopically" mean? Do you mean "... and other spectroscopic parameters have been calculated"?
            $endgroup$
            – orthocresol♦
            5 hours ago



















          6












          $begingroup$

          Yes, $ce{Hg2}$ has a bond length of $pu{0.334nm}$ and a dissociation energy of $pu{7.5 kJ/mol}$.



          See Mercury Handbook: Chemistry, Applications and Environmental Impact at page 10.



          and



          Mass spectrometric equilibrium study of the molecule $ce{Hg2}$ J. Chem. Phys. 1982, 77(3), 1425-1427 (https://doi.org/10.1063/1.443968).






          share|improve this answer











          $endgroup$









          • 1




            $begingroup$
            Respectfully, this isn't a molecule.
            $endgroup$
            – permeakra
            6 hours ago










          • $begingroup$
            @permeakra is the potential well enough to have at least one vibrational state?
            $endgroup$
            – DavePhD
            6 hours ago






          • 3




            $begingroup$
            Doesn't matter. Water dimer is not considered a molecule, even though the bonding it fairly strong.
            $endgroup$
            – permeakra
            6 hours ago






          • 2




            $begingroup$
            @permeakra it matters to IUPAC goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago





















          5












          $begingroup$

          The nature of mercury associates was studied. Quick googling gave paper with words "$ce{Hg_x}$ cluster transition from VdW to metallic bahavior between 20 and 70 atoms", suggesting that $ce{Hg_2}$ associate, if exists, have VdW bonding (i.e. not a chemical, but physical bond) only.






          share|improve this answer









          $endgroup$









          • 1




            $begingroup$
            According to IUPAC, the type of binding isn't relevant, as long as there is "a depression on the potential energy surface that is deep enough to confine at least one vibrational state" goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago






          • 1




            $begingroup$
            @DavePhD What IUPAC says and what is accepted in the community are two entirely different things.
            $endgroup$
            – permeakra
            4 hours ago










          • $begingroup$
            permeakra, I agree, and I cited a J. Chem. Phys. article that says "molecule Hg2" in the title. aip.scitation.org/doi/10.1063/1.443968 Here's one that says "Hg2 molecule". aip.scitation.org/doi/pdf/10.1063/1.449261
            $endgroup$
            – DavePhD
            3 hours ago










          • $begingroup$
            @DavePhD Again, what is accepted in physics community (J. of Chemical Physics) and chemical community (like chemistry stackexchange) also are two entirely different things. $ce{He_2}$ associate is a thing and from physical perspective might be a molecule. But from chemical perspective He is not capable to form chemical bonds (except in conditions that are domain of physics) and thus $ce{He_2}$ is not a molecule. Same for $ce{Hg_2}$
            $endgroup$
            – permeakra
            3 hours ago












          • $begingroup$
            The Journal of Physical Chemistry, published by the American Chemical Society, says "the Hg2 molecule". pubs.acs.org/doi/abs/10.1021/jp952808p?journalCode=jpchax The Canadian Journal of Chemistry says "Hg2 molecule". nrcresearchpress.com/doi/pdf/10.1139/v68-031 It's just a word. It doesn't change the science.
            $endgroup$
            – DavePhD
            2 hours ago











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          3 Answers
          3






          active

          oldest

          votes








          3 Answers
          3






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          8












          $begingroup$

          There has been recent research on mercury dimers in its ground state. Bond energies, transition energies, band spectrum and other parameters has been calculated spectroscopically. Here are the abstracts of two papers on mercury dimer:





          1. The potential energy curve of the ground electronic state of the Hg dimer has been calculated using the CCSD(T) procedure and relativistic effective core potentials. The calculated binding energy (0.047 eV) and equilibrium separation (3.72 Å) are in excellent agreement with experiment. A variety of properties, including the second virial coefficient, rotational and vibrational spectroscopic constants, and vibrational energy levels, have been calculated using this interatomic potential and agreement with experiment is good overall.(Source)




          2. The mercury dimer is among the most weakly bound metal dimers and has been extensively studied. The ground state $ce{O^+_g}$ dissociation energy has been considered to lie between 0.55 eV (440 cm−1) and 0.091 eV (730 cm−1). We report here a spectroscopic study of $ce{Hg2}$ in a supersonic jet. The first optical transition, $ce{1_u←O^+_g}$, was characterized by its fluorescence excitation spectrum and the binding energy of the ground state has been measured precisely through the threshold of collision induced dissociation of $ce{Hg2 1_u}$ to $ce{Hg(^1S_0)+Hg(^3P_0)}$.(Source)








          share|improve this answer









          $endgroup$













          • $begingroup$
            What does "has been calculated spectroscopically" mean? Do you mean "... and other spectroscopic parameters have been calculated"?
            $endgroup$
            – orthocresol♦
            5 hours ago
















          8












          $begingroup$

          There has been recent research on mercury dimers in its ground state. Bond energies, transition energies, band spectrum and other parameters has been calculated spectroscopically. Here are the abstracts of two papers on mercury dimer:





          1. The potential energy curve of the ground electronic state of the Hg dimer has been calculated using the CCSD(T) procedure and relativistic effective core potentials. The calculated binding energy (0.047 eV) and equilibrium separation (3.72 Å) are in excellent agreement with experiment. A variety of properties, including the second virial coefficient, rotational and vibrational spectroscopic constants, and vibrational energy levels, have been calculated using this interatomic potential and agreement with experiment is good overall.(Source)




          2. The mercury dimer is among the most weakly bound metal dimers and has been extensively studied. The ground state $ce{O^+_g}$ dissociation energy has been considered to lie between 0.55 eV (440 cm−1) and 0.091 eV (730 cm−1). We report here a spectroscopic study of $ce{Hg2}$ in a supersonic jet. The first optical transition, $ce{1_u←O^+_g}$, was characterized by its fluorescence excitation spectrum and the binding energy of the ground state has been measured precisely through the threshold of collision induced dissociation of $ce{Hg2 1_u}$ to $ce{Hg(^1S_0)+Hg(^3P_0)}$.(Source)








          share|improve this answer









          $endgroup$













          • $begingroup$
            What does "has been calculated spectroscopically" mean? Do you mean "... and other spectroscopic parameters have been calculated"?
            $endgroup$
            – orthocresol♦
            5 hours ago














          8












          8








          8





          $begingroup$

          There has been recent research on mercury dimers in its ground state. Bond energies, transition energies, band spectrum and other parameters has been calculated spectroscopically. Here are the abstracts of two papers on mercury dimer:





          1. The potential energy curve of the ground electronic state of the Hg dimer has been calculated using the CCSD(T) procedure and relativistic effective core potentials. The calculated binding energy (0.047 eV) and equilibrium separation (3.72 Å) are in excellent agreement with experiment. A variety of properties, including the second virial coefficient, rotational and vibrational spectroscopic constants, and vibrational energy levels, have been calculated using this interatomic potential and agreement with experiment is good overall.(Source)




          2. The mercury dimer is among the most weakly bound metal dimers and has been extensively studied. The ground state $ce{O^+_g}$ dissociation energy has been considered to lie between 0.55 eV (440 cm−1) and 0.091 eV (730 cm−1). We report here a spectroscopic study of $ce{Hg2}$ in a supersonic jet. The first optical transition, $ce{1_u←O^+_g}$, was characterized by its fluorescence excitation spectrum and the binding energy of the ground state has been measured precisely through the threshold of collision induced dissociation of $ce{Hg2 1_u}$ to $ce{Hg(^1S_0)+Hg(^3P_0)}$.(Source)








          share|improve this answer









          $endgroup$



          There has been recent research on mercury dimers in its ground state. Bond energies, transition energies, band spectrum and other parameters has been calculated spectroscopically. Here are the abstracts of two papers on mercury dimer:





          1. The potential energy curve of the ground electronic state of the Hg dimer has been calculated using the CCSD(T) procedure and relativistic effective core potentials. The calculated binding energy (0.047 eV) and equilibrium separation (3.72 Å) are in excellent agreement with experiment. A variety of properties, including the second virial coefficient, rotational and vibrational spectroscopic constants, and vibrational energy levels, have been calculated using this interatomic potential and agreement with experiment is good overall.(Source)




          2. The mercury dimer is among the most weakly bound metal dimers and has been extensively studied. The ground state $ce{O^+_g}$ dissociation energy has been considered to lie between 0.55 eV (440 cm−1) and 0.091 eV (730 cm−1). We report here a spectroscopic study of $ce{Hg2}$ in a supersonic jet. The first optical transition, $ce{1_u←O^+_g}$, was characterized by its fluorescence excitation spectrum and the binding energy of the ground state has been measured precisely through the threshold of collision induced dissociation of $ce{Hg2 1_u}$ to $ce{Hg(^1S_0)+Hg(^3P_0)}$.(Source)









          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 6 hours ago









          Nilay GhoshNilay Ghosh

          9,230839101




          9,230839101












          • $begingroup$
            What does "has been calculated spectroscopically" mean? Do you mean "... and other spectroscopic parameters have been calculated"?
            $endgroup$
            – orthocresol♦
            5 hours ago


















          • $begingroup$
            What does "has been calculated spectroscopically" mean? Do you mean "... and other spectroscopic parameters have been calculated"?
            $endgroup$
            – orthocresol♦
            5 hours ago
















          $begingroup$
          What does "has been calculated spectroscopically" mean? Do you mean "... and other spectroscopic parameters have been calculated"?
          $endgroup$
          – orthocresol♦
          5 hours ago




          $begingroup$
          What does "has been calculated spectroscopically" mean? Do you mean "... and other spectroscopic parameters have been calculated"?
          $endgroup$
          – orthocresol♦
          5 hours ago











          6












          $begingroup$

          Yes, $ce{Hg2}$ has a bond length of $pu{0.334nm}$ and a dissociation energy of $pu{7.5 kJ/mol}$.



          See Mercury Handbook: Chemistry, Applications and Environmental Impact at page 10.



          and



          Mass spectrometric equilibrium study of the molecule $ce{Hg2}$ J. Chem. Phys. 1982, 77(3), 1425-1427 (https://doi.org/10.1063/1.443968).






          share|improve this answer











          $endgroup$









          • 1




            $begingroup$
            Respectfully, this isn't a molecule.
            $endgroup$
            – permeakra
            6 hours ago










          • $begingroup$
            @permeakra is the potential well enough to have at least one vibrational state?
            $endgroup$
            – DavePhD
            6 hours ago






          • 3




            $begingroup$
            Doesn't matter. Water dimer is not considered a molecule, even though the bonding it fairly strong.
            $endgroup$
            – permeakra
            6 hours ago






          • 2




            $begingroup$
            @permeakra it matters to IUPAC goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago


















          6












          $begingroup$

          Yes, $ce{Hg2}$ has a bond length of $pu{0.334nm}$ and a dissociation energy of $pu{7.5 kJ/mol}$.



          See Mercury Handbook: Chemistry, Applications and Environmental Impact at page 10.



          and



          Mass spectrometric equilibrium study of the molecule $ce{Hg2}$ J. Chem. Phys. 1982, 77(3), 1425-1427 (https://doi.org/10.1063/1.443968).






          share|improve this answer











          $endgroup$









          • 1




            $begingroup$
            Respectfully, this isn't a molecule.
            $endgroup$
            – permeakra
            6 hours ago










          • $begingroup$
            @permeakra is the potential well enough to have at least one vibrational state?
            $endgroup$
            – DavePhD
            6 hours ago






          • 3




            $begingroup$
            Doesn't matter. Water dimer is not considered a molecule, even though the bonding it fairly strong.
            $endgroup$
            – permeakra
            6 hours ago






          • 2




            $begingroup$
            @permeakra it matters to IUPAC goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago
















          6












          6








          6





          $begingroup$

          Yes, $ce{Hg2}$ has a bond length of $pu{0.334nm}$ and a dissociation energy of $pu{7.5 kJ/mol}$.



          See Mercury Handbook: Chemistry, Applications and Environmental Impact at page 10.



          and



          Mass spectrometric equilibrium study of the molecule $ce{Hg2}$ J. Chem. Phys. 1982, 77(3), 1425-1427 (https://doi.org/10.1063/1.443968).






          share|improve this answer











          $endgroup$



          Yes, $ce{Hg2}$ has a bond length of $pu{0.334nm}$ and a dissociation energy of $pu{7.5 kJ/mol}$.



          See Mercury Handbook: Chemistry, Applications and Environmental Impact at page 10.



          and



          Mass spectrometric equilibrium study of the molecule $ce{Hg2}$ J. Chem. Phys. 1982, 77(3), 1425-1427 (https://doi.org/10.1063/1.443968).







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 5 hours ago









          Mathew Mahindaratne

          2328




          2328










          answered 6 hours ago









          DavePhDDavePhD

          35.3k259141




          35.3k259141








          • 1




            $begingroup$
            Respectfully, this isn't a molecule.
            $endgroup$
            – permeakra
            6 hours ago










          • $begingroup$
            @permeakra is the potential well enough to have at least one vibrational state?
            $endgroup$
            – DavePhD
            6 hours ago






          • 3




            $begingroup$
            Doesn't matter. Water dimer is not considered a molecule, even though the bonding it fairly strong.
            $endgroup$
            – permeakra
            6 hours ago






          • 2




            $begingroup$
            @permeakra it matters to IUPAC goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago
















          • 1




            $begingroup$
            Respectfully, this isn't a molecule.
            $endgroup$
            – permeakra
            6 hours ago










          • $begingroup$
            @permeakra is the potential well enough to have at least one vibrational state?
            $endgroup$
            – DavePhD
            6 hours ago






          • 3




            $begingroup$
            Doesn't matter. Water dimer is not considered a molecule, even though the bonding it fairly strong.
            $endgroup$
            – permeakra
            6 hours ago






          • 2




            $begingroup$
            @permeakra it matters to IUPAC goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago










          1




          1




          $begingroup$
          Respectfully, this isn't a molecule.
          $endgroup$
          – permeakra
          6 hours ago




          $begingroup$
          Respectfully, this isn't a molecule.
          $endgroup$
          – permeakra
          6 hours ago












          $begingroup$
          @permeakra is the potential well enough to have at least one vibrational state?
          $endgroup$
          – DavePhD
          6 hours ago




          $begingroup$
          @permeakra is the potential well enough to have at least one vibrational state?
          $endgroup$
          – DavePhD
          6 hours ago




          3




          3




          $begingroup$
          Doesn't matter. Water dimer is not considered a molecule, even though the bonding it fairly strong.
          $endgroup$
          – permeakra
          6 hours ago




          $begingroup$
          Doesn't matter. Water dimer is not considered a molecule, even though the bonding it fairly strong.
          $endgroup$
          – permeakra
          6 hours ago




          2




          2




          $begingroup$
          @permeakra it matters to IUPAC goldbook.iupac.org/html/M/M04002.html
          $endgroup$
          – DavePhD
          6 hours ago






          $begingroup$
          @permeakra it matters to IUPAC goldbook.iupac.org/html/M/M04002.html
          $endgroup$
          – DavePhD
          6 hours ago













          5












          $begingroup$

          The nature of mercury associates was studied. Quick googling gave paper with words "$ce{Hg_x}$ cluster transition from VdW to metallic bahavior between 20 and 70 atoms", suggesting that $ce{Hg_2}$ associate, if exists, have VdW bonding (i.e. not a chemical, but physical bond) only.






          share|improve this answer









          $endgroup$









          • 1




            $begingroup$
            According to IUPAC, the type of binding isn't relevant, as long as there is "a depression on the potential energy surface that is deep enough to confine at least one vibrational state" goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago






          • 1




            $begingroup$
            @DavePhD What IUPAC says and what is accepted in the community are two entirely different things.
            $endgroup$
            – permeakra
            4 hours ago










          • $begingroup$
            permeakra, I agree, and I cited a J. Chem. Phys. article that says "molecule Hg2" in the title. aip.scitation.org/doi/10.1063/1.443968 Here's one that says "Hg2 molecule". aip.scitation.org/doi/pdf/10.1063/1.449261
            $endgroup$
            – DavePhD
            3 hours ago










          • $begingroup$
            @DavePhD Again, what is accepted in physics community (J. of Chemical Physics) and chemical community (like chemistry stackexchange) also are two entirely different things. $ce{He_2}$ associate is a thing and from physical perspective might be a molecule. But from chemical perspective He is not capable to form chemical bonds (except in conditions that are domain of physics) and thus $ce{He_2}$ is not a molecule. Same for $ce{Hg_2}$
            $endgroup$
            – permeakra
            3 hours ago












          • $begingroup$
            The Journal of Physical Chemistry, published by the American Chemical Society, says "the Hg2 molecule". pubs.acs.org/doi/abs/10.1021/jp952808p?journalCode=jpchax The Canadian Journal of Chemistry says "Hg2 molecule". nrcresearchpress.com/doi/pdf/10.1139/v68-031 It's just a word. It doesn't change the science.
            $endgroup$
            – DavePhD
            2 hours ago
















          5












          $begingroup$

          The nature of mercury associates was studied. Quick googling gave paper with words "$ce{Hg_x}$ cluster transition from VdW to metallic bahavior between 20 and 70 atoms", suggesting that $ce{Hg_2}$ associate, if exists, have VdW bonding (i.e. not a chemical, but physical bond) only.






          share|improve this answer









          $endgroup$









          • 1




            $begingroup$
            According to IUPAC, the type of binding isn't relevant, as long as there is "a depression on the potential energy surface that is deep enough to confine at least one vibrational state" goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago






          • 1




            $begingroup$
            @DavePhD What IUPAC says and what is accepted in the community are two entirely different things.
            $endgroup$
            – permeakra
            4 hours ago










          • $begingroup$
            permeakra, I agree, and I cited a J. Chem. Phys. article that says "molecule Hg2" in the title. aip.scitation.org/doi/10.1063/1.443968 Here's one that says "Hg2 molecule". aip.scitation.org/doi/pdf/10.1063/1.449261
            $endgroup$
            – DavePhD
            3 hours ago










          • $begingroup$
            @DavePhD Again, what is accepted in physics community (J. of Chemical Physics) and chemical community (like chemistry stackexchange) also are two entirely different things. $ce{He_2}$ associate is a thing and from physical perspective might be a molecule. But from chemical perspective He is not capable to form chemical bonds (except in conditions that are domain of physics) and thus $ce{He_2}$ is not a molecule. Same for $ce{Hg_2}$
            $endgroup$
            – permeakra
            3 hours ago












          • $begingroup$
            The Journal of Physical Chemistry, published by the American Chemical Society, says "the Hg2 molecule". pubs.acs.org/doi/abs/10.1021/jp952808p?journalCode=jpchax The Canadian Journal of Chemistry says "Hg2 molecule". nrcresearchpress.com/doi/pdf/10.1139/v68-031 It's just a word. It doesn't change the science.
            $endgroup$
            – DavePhD
            2 hours ago














          5












          5








          5





          $begingroup$

          The nature of mercury associates was studied. Quick googling gave paper with words "$ce{Hg_x}$ cluster transition from VdW to metallic bahavior between 20 and 70 atoms", suggesting that $ce{Hg_2}$ associate, if exists, have VdW bonding (i.e. not a chemical, but physical bond) only.






          share|improve this answer









          $endgroup$



          The nature of mercury associates was studied. Quick googling gave paper with words "$ce{Hg_x}$ cluster transition from VdW to metallic bahavior between 20 and 70 atoms", suggesting that $ce{Hg_2}$ associate, if exists, have VdW bonding (i.e. not a chemical, but physical bond) only.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 6 hours ago









          permeakrapermeakra

          17.9k13681




          17.9k13681








          • 1




            $begingroup$
            According to IUPAC, the type of binding isn't relevant, as long as there is "a depression on the potential energy surface that is deep enough to confine at least one vibrational state" goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago






          • 1




            $begingroup$
            @DavePhD What IUPAC says and what is accepted in the community are two entirely different things.
            $endgroup$
            – permeakra
            4 hours ago










          • $begingroup$
            permeakra, I agree, and I cited a J. Chem. Phys. article that says "molecule Hg2" in the title. aip.scitation.org/doi/10.1063/1.443968 Here's one that says "Hg2 molecule". aip.scitation.org/doi/pdf/10.1063/1.449261
            $endgroup$
            – DavePhD
            3 hours ago










          • $begingroup$
            @DavePhD Again, what is accepted in physics community (J. of Chemical Physics) and chemical community (like chemistry stackexchange) also are two entirely different things. $ce{He_2}$ associate is a thing and from physical perspective might be a molecule. But from chemical perspective He is not capable to form chemical bonds (except in conditions that are domain of physics) and thus $ce{He_2}$ is not a molecule. Same for $ce{Hg_2}$
            $endgroup$
            – permeakra
            3 hours ago












          • $begingroup$
            The Journal of Physical Chemistry, published by the American Chemical Society, says "the Hg2 molecule". pubs.acs.org/doi/abs/10.1021/jp952808p?journalCode=jpchax The Canadian Journal of Chemistry says "Hg2 molecule". nrcresearchpress.com/doi/pdf/10.1139/v68-031 It's just a word. It doesn't change the science.
            $endgroup$
            – DavePhD
            2 hours ago














          • 1




            $begingroup$
            According to IUPAC, the type of binding isn't relevant, as long as there is "a depression on the potential energy surface that is deep enough to confine at least one vibrational state" goldbook.iupac.org/html/M/M04002.html
            $endgroup$
            – DavePhD
            6 hours ago






          • 1




            $begingroup$
            @DavePhD What IUPAC says and what is accepted in the community are two entirely different things.
            $endgroup$
            – permeakra
            4 hours ago










          • $begingroup$
            permeakra, I agree, and I cited a J. Chem. Phys. article that says "molecule Hg2" in the title. aip.scitation.org/doi/10.1063/1.443968 Here's one that says "Hg2 molecule". aip.scitation.org/doi/pdf/10.1063/1.449261
            $endgroup$
            – DavePhD
            3 hours ago










          • $begingroup$
            @DavePhD Again, what is accepted in physics community (J. of Chemical Physics) and chemical community (like chemistry stackexchange) also are two entirely different things. $ce{He_2}$ associate is a thing and from physical perspective might be a molecule. But from chemical perspective He is not capable to form chemical bonds (except in conditions that are domain of physics) and thus $ce{He_2}$ is not a molecule. Same for $ce{Hg_2}$
            $endgroup$
            – permeakra
            3 hours ago












          • $begingroup$
            The Journal of Physical Chemistry, published by the American Chemical Society, says "the Hg2 molecule". pubs.acs.org/doi/abs/10.1021/jp952808p?journalCode=jpchax The Canadian Journal of Chemistry says "Hg2 molecule". nrcresearchpress.com/doi/pdf/10.1139/v68-031 It's just a word. It doesn't change the science.
            $endgroup$
            – DavePhD
            2 hours ago








          1




          1




          $begingroup$
          According to IUPAC, the type of binding isn't relevant, as long as there is "a depression on the potential energy surface that is deep enough to confine at least one vibrational state" goldbook.iupac.org/html/M/M04002.html
          $endgroup$
          – DavePhD
          6 hours ago




          $begingroup$
          According to IUPAC, the type of binding isn't relevant, as long as there is "a depression on the potential energy surface that is deep enough to confine at least one vibrational state" goldbook.iupac.org/html/M/M04002.html
          $endgroup$
          – DavePhD
          6 hours ago




          1




          1




          $begingroup$
          @DavePhD What IUPAC says and what is accepted in the community are two entirely different things.
          $endgroup$
          – permeakra
          4 hours ago




          $begingroup$
          @DavePhD What IUPAC says and what is accepted in the community are two entirely different things.
          $endgroup$
          – permeakra
          4 hours ago












          $begingroup$
          permeakra, I agree, and I cited a J. Chem. Phys. article that says "molecule Hg2" in the title. aip.scitation.org/doi/10.1063/1.443968 Here's one that says "Hg2 molecule". aip.scitation.org/doi/pdf/10.1063/1.449261
          $endgroup$
          – DavePhD
          3 hours ago




          $begingroup$
          permeakra, I agree, and I cited a J. Chem. Phys. article that says "molecule Hg2" in the title. aip.scitation.org/doi/10.1063/1.443968 Here's one that says "Hg2 molecule". aip.scitation.org/doi/pdf/10.1063/1.449261
          $endgroup$
          – DavePhD
          3 hours ago












          $begingroup$
          @DavePhD Again, what is accepted in physics community (J. of Chemical Physics) and chemical community (like chemistry stackexchange) also are two entirely different things. $ce{He_2}$ associate is a thing and from physical perspective might be a molecule. But from chemical perspective He is not capable to form chemical bonds (except in conditions that are domain of physics) and thus $ce{He_2}$ is not a molecule. Same for $ce{Hg_2}$
          $endgroup$
          – permeakra
          3 hours ago






          $begingroup$
          @DavePhD Again, what is accepted in physics community (J. of Chemical Physics) and chemical community (like chemistry stackexchange) also are two entirely different things. $ce{He_2}$ associate is a thing and from physical perspective might be a molecule. But from chemical perspective He is not capable to form chemical bonds (except in conditions that are domain of physics) and thus $ce{He_2}$ is not a molecule. Same for $ce{Hg_2}$
          $endgroup$
          – permeakra
          3 hours ago














          $begingroup$
          The Journal of Physical Chemistry, published by the American Chemical Society, says "the Hg2 molecule". pubs.acs.org/doi/abs/10.1021/jp952808p?journalCode=jpchax The Canadian Journal of Chemistry says "Hg2 molecule". nrcresearchpress.com/doi/pdf/10.1139/v68-031 It's just a word. It doesn't change the science.
          $endgroup$
          – DavePhD
          2 hours ago




          $begingroup$
          The Journal of Physical Chemistry, published by the American Chemical Society, says "the Hg2 molecule". pubs.acs.org/doi/abs/10.1021/jp952808p?journalCode=jpchax The Canadian Journal of Chemistry says "Hg2 molecule". nrcresearchpress.com/doi/pdf/10.1139/v68-031 It's just a word. It doesn't change the science.
          $endgroup$
          – DavePhD
          2 hours ago










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