NEAR-INFRARED AND VISIBLE LUMINESCENCE AND ABSORPTION-SPECTROSCOPY OFLOW-COORDINATE ORGANOMETALLIC RHENIUM COMPOUNDS

Low-temperature absorption and luminescence spectra of four organorhen ium compounds were measured in the visible and near-infrared spectral regions. Effects of the temperature, formal oxidation state, and the o xo-, bromo-, and organic ligands on the metal center are reported. The emission maxima of the four compounds show a large variation between 9000 and 14 200 cm(-1). Stokes shifts show a smaller variation from 37 00 to 4200 cm(-1). Luminescence intensities are used to qualitatively characterize nonradiative relaxation processes.