Photochemical generation of cyclopentadienyliron dicarbonyl anion by a nicotinamide adenine dinucleotide dimer analogue

A convenient method for the generation of [CpFe(CO)(sub 2)](super -) by the photochemical reduction of [CpFe(CO)(sub 2)](sub 2) by a unique organic two-electron donor, that is, an NAD (nicotinamide adenine dinucleotide) dimer analogue 1-benzyl-1,4-dihydronicotinamide dimer [(BNA)(sub 2)](super 18,19) is reported. The studies suggest that the photochemical generation of [CpFe(CO)(sub 2)](super -) by (BNA)(sub 2) proceeds through photoinduced electron transfer from the triplet excited state of (BNA)(sub 2) to [CpFe(CO)(sub 2)](sub 2).