Abstract
The Raman and the infrared spectra of tetraamminecobalt(III) complexes have been measured to find the vibrational criteria for differentiating between the cis and trans configurations. Conspicuous differences between the isomers were found in the ν(Co–NH3) region. Thus, generally the trans isomers have two bands at ca. 480 and ca. 450 cm−1 in the Raman spectra and one band at ca. 510 cm−1 in the infrared spectra, and the mutual exclusion rule virtually holds. On the other hand, the cis isomers have more than three bands in the region of both the Raman and the infrared spectra.

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