ANODIC INFRARED SPECTROELECTROCHEMISTRY OF MONONUCLEAR AND DINUCLEAR COMPLEXES CONTAINING THE (ETA(5)-C(5)H(4)R)MN(CO)(2)L MOIETY (L=CO OR PR(3))

A series of manganese and dimanganese organometallic complexes contain ing carbonyl ligands were studied by voltammetry, coulometry and IR sp ectroelectrochemistry. One-electron oxidations to cations were reversi ble at sub-ambient temperatures in dichloromethane for all complexes i ncorporating a phosphine ligand, two such processes being observed for the dinuclear complexes. The mono- and dications were characterized b y IR spectroelectrochemistry using a thin-layer cell in the transmissi on mode. Good results were obtained for dichloromethane solutions with temperatures as low as 213 K. All of the mixed-valent monocations of the di-manganese complexes exhibited trapped valency.