Luminescence, excitation and far-infrared spectroscopy of cis-α-dichlorotriethyleneteraminechromium(III) chloride

The 77 K luminescence and excitation spectra, and 298 K infrared and absorption spectra of cis-α-[Cr(trien)Cl2]Cl·H2O (trien=triethylenetetramine) have been measured. Ligand field electronic transitions due to spin-allowed and spin-forbidden are assigned. The zero-phonon line in the excitation spectrum splits into two components by 198 cm-1, and the large 2Eg splitting can be reproduced by the modern ligand field theory. It is confirmed that nitrogen atoms of the trien ligand have a strong σ-donor chloride ligand has weak σ-and π-donor properties toward chromium(III) ion