The preparation and characterization of some imido- and diazenido-rhenium complexes of maltol. The X-ray crystal structure of [Re(maltol)2(NPh)(PPh3)][BPh4]
摘要:
The imido complex [ReCl3(NPh)(PPh3)2] reacts with excess maltol to give the green complex [Re(maltol)2(NPh)(PPh3)][BPh4] (1). Under analogous conditions, [ReCl2(N2COPh)(PPh3)2] gives [ReCl(maltol)(N2COPh)(PPh3)2] (2). An X-ray crystal structure of complex 1 revealed a distorted octahedral structure with cis-maltol ligands. Preliminary X-ray data on a poorly diffracting crystal of complex 2 has confirmed the formulation and stereochemistry. The possible structures of products from other precursors are discussed together with their redox and spectroscopic properties.