Spin-forbidden bands in the aqueous solution spectra of the Trisoxalato- and Trismalonato-chromium(III) anions

Abstract

The aqueous solution spectra of the trisoxalato- and trismalonato-chromium(111) anions show a number of weak spin-forbidden bands in the visible and near infrared. These bands are shown to arise from vibronic coupling rather than from the presence of a trigonal field. The ⁴A₂ → ²E transition is shown to be characteristic of several chromium-oxalato complexes.