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The complete series of tetrakis(halomercuri)methanes C(HgX) 4  (X = F, Cl, Br and I) was prepared by metathesis of tetrakis(acetoxymercuri)methane and aqueous hydrofluoric acid and solutions of halides (Cl-, Br-, and I-), respectively. All compounds are insoluble in most common solvents, but partly soluble in dimethylsulfoxide. Complete vibrational spectra indicate more or less ideally tetrahedral molecules C(HgX) 4  in all cases. The originally triply degenerate valence vibrations of the CHg 4  entities and the force constants for the C-Hg bonds show distinct correlations with the electronegativities of the halides X. On the other hand the totally symmetrical valence vibrations of CHg 4  were found to be highly sensitive to variations in X, mainly due to coupling with the valence vibrations of the Hg-X-groups of the same symmetry species. Some analogies in the vibrational behaviour of the CHg 4  fragments and of the isosteric NHg 4  core in tetramercurioammonium complexes were observed and discussed.

zeitschrift für naturforschung b

Tetraquecksilbermethane, II [1]Tetrakis(halogenoquecksilber)-methane C(HgX) 4  (X = F, Cl, Br und I): Synthesen und Schwingungsspektren / Tetramercurimethanes, II [1]Tetrakis(halomercuri)methanes C(HgX) 4  (X = F, Cl, Br und I): Syntheses and Vibrational Spectra