The infrared spectra of twenty Co(III) carbonato complexes have been measured in a range between 4000 and 300 cm—1. Normal coordinate treatments were made with a model based on the unidentate and bidentate forms of the 1:1 (metal/ligand) complex. The theoretical band assignments and force constants obtained by these calculations confirm the validity of the previous qualitative conclusions based on the differences of symmetry and the frequency shifts of the unidentate and bidentate complexes. The Co(III)‐O stretching bands were located at 440∼380 (antisymmetric) and at 400∼350 (symmetric) for the bidentate complexes, and at 360∼340 cm—1 for the unidentate complexes.

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