Photosubstitution of dichloro(2,2′-diamino-1,1′-binaphthyl)platinum(II)

The absorption spectrum of Pt(DABN)Cl-2 (DABN = 2,2'-diamino-1,1'-binaphthyl) shows a ligand field (LF) band at lambda(max) = 385 nm and intraligand (IL) bands of DABN at shorter wavelengths (lambda(max) = 364, 330, 316, 288, 266, 241, 224 and 212 nm). The photolysis of Pt(DABN)Cl-2 in CH3CN leads to the release of the DABN ligand. The quantum yield of this photosubstitution is phi similar to 0.036 and independent of the irradiating wavelength. It is suggested that this photoreaction is induced by LF or IL excitation. (C) 1998 Elsevier Science S.A. All rights reserved.