2E→4A transition of the hexa-amminechromium(III) ion in non-cubic environments

Abstract

The ²E→⁴A_2g transition of a series of carefully purified salts containing the Cr(NH₃)³⁺₆ ion has been measured in emission and absorption at 80 and 5 K. The vibronic spectra show splittings which are interpreted in terms of the symmetry of the lattice site occupied by the ion. These splittings confirm the assignments given previously for the Cr(NH₃)³⁺₆ ion in cubic environments and remove some of the ambiguities. They also provide some structural information.