Infrared spectra of some metal thiourea complexes have been measured in the 2-35 µ region. The spectra reveal that thiourea forms sulfur-to-metal bonds in all complexes studied. The calculation of the normal vibrations of thiourea is reported. Based on the result of this calculation, the absorption bands observed in the metal thiourea complexes have been assigned.

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Infrared spectra of nitropentamminecobalt(III) chloride and mtritopentamminecobalt(III) chloride in the solid state have been measured. Spectral evidence is presented to support the conversion of nitritopentamminecobalt(III) chloride to nitropentamminecobalt(III) chloride. In the spectra of these complexes the deformation vibration frequencies of the NH3 ligand, degenerate, symmetric and rocking are identified. The remaining absorption bands in the region from 1700 to 650 cm.-1 (5.8-15 µ) can be assigned to the nitro and nitrito frequencies. Changes in the spectrum of the nitritopentamminecobalt(III) ion with regard to intensity of certain bands with time are significant. Bands which show such changes in absorption are assigned to those parts of the complex which are responsible for nitrito and nitro vibrations. By comparison of the spectra of the pure nitro and the freshly prepared nitrito isomers, the bands that decrease in intensity can be assigned to the nitrito group, while those new bands that appear and gradually increase in intensity can be assigned to the nitro group.

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