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Aqueous solutions of 'mercurous nitrate' are shown by Raman spectra to contain the complexes [Hg2(OH2)NO3]+ and [Hg2(OH2)2]2+. Crystalline dimercury(I) nitrate, Hg2(NO3)2,2H2O, and its solid hydrolysis products Hg2(OH)2,3Hg2(NO3)2, 2Hg2(OH)2,3Hg2(NO3)2,H2O and Hg2(OH)2,- Hg2(NO3)2 have been obtained: the vibrational spectra are reported and interpreted in terms of possible structures. Modes v(Hg-Hg) appear in the range 170- 200 cm-1 and are sensitive to the particular combination of the ligands OH, ONO2, and H2O attached to the dimercury(I) ion.

Raman and i.r. spectra of the series of compounds MeHg(pyx)ClO4, Hg(pyx)n(ClO4)2 and Hg2- (pyx)n(ClO4)2 (pyx = pyridine or a pyridine derivative; n = 2 or in some cases 4) are reported. In the low- frequency region, the spectra of the complex cations provide the basis of assignments of Hg-N (160-260 cm-1) and Hg-Hg (110-160 cm-1) stretching frequencies.

Raman and IR spectra of the crystalline solids Hg2(H2P04)2, Hg,(PO,), and Hg,Se04 are reported and assigned in terms of vibrational modes of the unit cell. Frequencies v(Hg-0) and v(Hg-Hg) are located in the ranges 210-2150 and 180-190 cm-', respectively. Inter-and intramolecular coupling of Hg-0 modes, and of some ligand vibrations, result in splittings of from 5 to 40 cm-', which can be related to the crystal and molecular structures.

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