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The infrared spectra from 4000 to 70 cm−1 of several hydrated and anhydrous salts of transition metals have been obtained. A comparison of the spectra of a hydrate with a full coordination shell of water, of a lower hydrate, and of the anhydrous salt is made. Differences in the spectra are discussed.

The far-infrared spectra from 350 to 70 cm−1 of the anhydrous nitrates of Li, Na, K, Ca, Sr, Ba, Ag, Pb, Cu, Zn, Co, Mn, Nd, and Cd are reported. The possible nature of these absorptions is discussed.

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The reactions of Pt(PPh3)4 with elemental sulfur in ratios S/Pt = 3, 4, 5, and 6 give a mixture of compounds identified as [PtS(PPh3)2]2 and PtS4(PPh3)2; PtS2(PPh3)2 is not detected. The dimeric complex also forms on reaction of PtS4(PPh3)2 with 3 mol of Pt(C2H4)(PPh3)2. It is alkylated at one bridging sulfido ligand by CH2Cl2 and CHCl3 to give cations [Pt2(μ-S)-(μ-SR)(PPh3)4]+, R = CH2Cl and CHCl2, respectively, which are characterized as their hexafluorophosphate salts. The cations give extreme AA′BB′X 31Pmr spectra since their cis-phosphorus atoms (A,B) have very similar chemical shifts but different coupling constants to 195Pt(X); spectral features are broadened by thiolate inversion processes. Reactions of bridging sulfido ligands with other electrophiles are discussed.