Charge transfer interaction between bis(triphenylphosphine)copper(I) borohydride and 9,10-phenanthrenequinone.: Absorption spectrum and photoreactivity of the donor–acceptor adduct

Abstract

The complex (PPh 3) 2CuBH 4 and 9,10-phenanthrenequinone form a weak adduct in CH 2Cl 2 which dissociates into its components in DMSO. The adduct is characterized by (PPh 3) 2CuBH 4→phenanthrenequinone outer sphere charge transfer (OSCT) absorptions at λ max=707 and 514 nm. The coordinated BH 4 − ligand reduces the quinone to hydroquinone thermally and photochemically by OSCT excitation with φ=0.05 at λ irr=700 nm.