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Mercury(IV) fluoride
Mercury(IV) fluoride, HgF4, is the first mercury compound to be discovered with mercury in the oxidation state IV. Mercury, like the other group 12 elements (cadmium and zinc), has an s2d10 electron configuration and generally only forms bonds involving its s orbital. This means that the highest oxidation state mercury normally attains is II, and for this reason it is usually considered a post-transition metal instead of a transition metal.
==History==
Speculation about higher oxidation states for mercury had been around since the 1970s, and theoretical calculations in the 1990s predicted that it should be stable in the gas phase, with a square-planar geometry consistent with a formal d8 configuration. However, experimental proof remained elusive until 2007, when HgF4 was first prepared using solid neon and argon for matrix isolation at a temperature of 4 K. The compound was detected using infrared spectroscopy.〔(【引用サイトリンク】title=Elusive Hg(IV) species has been synthesized under cryogenic conditions )〕 Analysis of density functional theory and coupled cluster calculations showed that the d orbitals are involved in bonding, leading to the suggestion that mercury should be considered a transition metal after all. However, that conclusion has been challenged by W. B. Jensen with the argument that HgF4 only exists under highly atypical non-equilibrium conditions and should best be considered as an exception.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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