Magnetic circular dichroism spectroscopy of the hexacyano complexes of Ru(III) and Os(III)

Abstract

The UV-Vis absorption and magnetic circular dichroism spectra of (Bu4N)3Ru(CN)6 and (Bu4N)3Os(CN)6 were measured at 4.2 K. The MCD spectra confirm the assignments of the ligand-to-metal charge transfer transitions in these complexes. They also cast doubt on earlier d-d assignments made for Os(CN)63- and Fe(CN)63-. Attempts to measure the intraconfigurational d-d splitting of the 2T2g ground state of (Bu4N)3Ru(CN)6 were unsuccessful. However, the near IR MCD spectrum of (Bu4N)3Os(CN)6 showed a sharp negative line at 4110 cm-1, with some weaker bands to higher energy. Show more