Photoluminescent mixed ligand complexes of CuX (XÂ =Â Cl, Br, I) with PPh3 and a polydentate imino-pyridyl ligand - Syntheses, structural variations and catalytic property

Three ternary copper(I) complexes [CuI2Cl2(L1)(PPh3)4] (1), [CuI2Br2(L1) (PPh3)4] (2) and [CuI2(μ-I)2 (μ-L1) (PPh3)2]n (3) have been prepared by reactions of CuX (X = Cl, Br and I) with PPh3 and the polydentate imino-pyridyl ligand L1. From single crystal structural analysis it has been found that complexes 1 and 2 are homo-dinuclear whereas complex 3 is a 1-D zig-zag polymer. All complexes function as effective catalysts for synthesis of 2-substituted benzoxazoles.