Charge transfer interaction between bis(triphenylphosphine)copper(I) borohydride and 9,10-phenanthrenequinone.

Abstract

The complex (PPh3)(2)CuBH4 and 9,10-phenanthrenequinone form a weak adduct in CH2Cl2 which dissociates into its components in DMSO. The adduct is characterized by (PPh3)(2)CuBH4 --> pherianthrenequitione outer sphere charge transfer (OSCT) absorptions at lambda(max) = 707 and 514 nm. The coordinated BH4- ligand reduces the quinone to hydroquinone thermally and photochemically by OSCT excitation with phi = 0.05 at lambda(irr) = 700 nm. (C) 2002 Elsevier Science B.V. All rights reserved.