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'''Mercury(I) hydride''' is a ] with the ] HgH. Mercury(I) hydride is a metal ] composed of ] and ]. It is not well-characterised or well-known, and is thermodynamically unstable with repect to the loss of the hydrogen atom. '''Mercury(I) hydride''' is a ] with the ] Hg<sub>2</sub>H<sub>2</sub>. Mercury(I) hydride is a metal ] composed of ] and ]. It is not well-characterised or well-known, and is thermodynamically unstable with repect to the loss of the hydrogen atoms.


Mercury(I) hydride is an unstable ]<ref>{{cite web|title=Mercury hydride|url=http://webbook.nist.gov/cgi/cbook.cgi?ID=C13966626&Units=SI&Mask=1#Thermo-Gas|work=Chemistry WebBook|publisher=National Institute of Standards and Technology|accessdate=14 October 2012|location=USA}}</ref> and is the heaviest group 12 monohydride. Furthermore, mercury(I) hydride has a linear (C<sub>∞v</sub>) structure. By weight percent, the composition of mercury(I) hydride is 0.50% hydrogen and 99.50% mercury. In mercury(I) hydride, the formal ]s of hydrogen and mercury are -1 and +1, respectively, because of the ] of mercury is lower than that of hydrogen. The stability of metal hydrides with the formula MH (M = Zn-Hg) increases as the atomic number of M increases. Mercury(I) hydride is an unstable ]<ref>{{cite web|title=Mercury hydride|url=http://webbook.nist.gov/cgi/cbook.cgi?ID=C13966626&Units=SI&Mask=1#Thermo-Gas|work=Chemistry WebBook|publisher=National Institute of Standards and Technology|accessdate=14 October 2012|location=USA}}</ref> and is the heaviest group 12 monohydride. Furthermore, mercury(I) hydride has a linear (C<sub>∞v</sub>) structure. By weight percent, the composition of mercury(I) hydride is 0.50% hydrogen and 99.50% mercury. In mercury(I) hydride, the formal ]s of hydrogen and mercury are -1 and +1, respectively, because of the ] of mercury is lower than that of hydrogen. The stability of metal hydrides with the formula M<sub>2</sub>H<sub>2</sub> (M = Zn-Hg) increases as the atomic number of M increases.


The Hg-H bond is very weak and therefore the compound has only been detected in ] at temperatures up to 6 K.<ref>{{cite journal|doi=10.1021/cr960151d|title=Hydrides of the Main-Group Metals:  New Variations on an Old Theme|year=2001|last1=Aldridge|first1=Simon|last2=Downs|first2=Anthony J.|journal=Chemical Reviews|volume=101|issue=11|pages=3305–65|pmid=11840988}}</ref><ref>{{cite journal|doi=10.1063/1.1676373|title=Hyperfine Interaction, Chemical Bonding, and Isotope Effect in ZnH, CdH, and HgH Molecules|year=1971|last1=Knight|first1=Lon B.|journal=The Journal of Chemical Physics|volume=55|issue=5|pages=2061}}</ref> The ], HgH<sub>2</sub>, has also been detected this way. The Hg-H bonds are very weak and therefore the compound has only been detected in ] at temperatures up to 6 K.<ref>{{cite journal|doi=10.1021/cr960151d|title=Hydrides of the Main-Group Metals:  New Variations on an Old Theme|year=2001|last1=Aldridge|first1=Simon|last2=Downs|first2=Anthony J.|journal=Chemical Reviews|volume=101|issue=11|pages=3305–65|pmid=11840988}}</ref><ref>{{cite journal|doi=10.1063/1.1676373|title=Hyperfine Interaction, Chemical Bonding, and Isotope Effect in ZnH, CdH, and HgH Molecules|year=1971|last1=Knight|first1=Lon B.|journal=The Journal of Chemical Physics|volume=55|issue=5|pages=2061}}</ref> ], HgH<sub>2</sub>, has also been detected this way.

A related compound is dihydrido-1κ''H'',2κ''H''-dimercury with the formula {{chem|Hg|2|H|2}}.


==References== ==References==

Revision as of 15:28, 14 October 2012

Mercury(I) hydride
Names
IUPAC name Mercury(I) hydride
Other names Dimercurane
Mercurous hydride
Identifiers
3D model (JSmol)
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Hg.HKey: DJSHOLCMNYJYSS-UHFFFAOYSA-N
SMILES
Properties
Chemical formula Hg
2H
2
Molar mass 403.20 g mol
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Mercury(I) hydride is a chemical compound with the chemical formula Hg2H2. Mercury(I) hydride is a metal hydride composed of mercury and hydrogen. It is not well-characterised or well-known, and is thermodynamically unstable with repect to the loss of the hydrogen atoms.

Mercury(I) hydride is an unstable gas and is the heaviest group 12 monohydride. Furthermore, mercury(I) hydride has a linear (C∞v) structure. By weight percent, the composition of mercury(I) hydride is 0.50% hydrogen and 99.50% mercury. In mercury(I) hydride, the formal oxidation states of hydrogen and mercury are -1 and +1, respectively, because of the electronegativity of mercury is lower than that of hydrogen. The stability of metal hydrides with the formula M2H2 (M = Zn-Hg) increases as the atomic number of M increases.

The Hg-H bonds are very weak and therefore the compound has only been detected in matrix isolation at temperatures up to 6 K. Mercury(II) hydride, HgH2, has also been detected this way.

References

  1. "Mercury hydride". Chemistry WebBook. USA: National Institute of Standards and Technology. Retrieved 14 October 2012.
  2. Aldridge, Simon; Downs, Anthony J. (2001). "Hydrides of the Main-Group Metals:  New Variations on an Old Theme". Chemical Reviews. 101 (11): 3305–65. doi:10.1021/cr960151d. PMID 11840988. {{cite journal}}: no-break space character in |title= at position 35 (help)
  3. Knight, Lon B. (1971). "Hyperfine Interaction, Chemical Bonding, and Isotope Effect in ZnH, CdH, and HgH Molecules". The Journal of Chemical Physics. 55 (5): 2061. doi:10.1063/1.1676373.
Mercury compounds
Mercury(I)
Mercury(II)
Organomercury
compounds
Mercury(IV)
Amalgams
Mercury cations
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