Photoluminescent properties and molecular structure of [{Au(PPh3)}2(µ-bbzim)] and[{Au(PPh3)}4(µ-bbzim)][ClO4]2(bbziM = 2,2′-bibenzimidazolate)

Abstract

The tetranuclear [{Au(PPh₃)}₄(µ-bbzim)][ClO₄]₂ and dinuclear [{Au(PPh₃)}₂(µ-bbzim)] complexes with 2,2′-bibenzimidazolate (bbzim) as bridging ligand have been characterized by X-ray crystallography. The intramolecular Au–Au separations in [{Au(PPh₃)}₄(µ-bbzim)][ClO₄]₂ are 3.157(1)–3.222(1)Å. Upon excitation at 330 nm, both complexes display intense intraligand fluorescence and phosphorescence in fluid solution at room temperature.