Luminescent cyclometalated N-heterocyclic carbene-containing organogold(III) complexes: Synthesis, characterization, electrochemistry, and photophysical studies

Ka Man Vonika AU, Keith Man-Chung WONG, Nianyong ZHU, Vivian Wing-Wah YAM

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Abstract

A new class of luminescent mononuclear and dinuclear N-heterocyclic carbene-containing gold(III) complexes has been synthesized and characterized. The X-ray crystal structures of most of the complexes have also been determined. Electrochemical studies reveal a ligand-centered reduction originated from the RCNCR moieties with no oxidation waves. Interestingly, one of the dinuclear complexes exhibited two distinct reduction couples instead of one with the first reduction occurring at less cathodic potential, probably related to the splitting of the π* orbital-based LUMO resulting from intramolecular π-π interaction. The electronic absorption and luminescence behaviors of the complexes have also been investigated. In dichloromethane solution at room temperature, the low-energy absorption bands are assigned as the intraligand π-π* transition, with mixing of a charge transfer character from the aryl ring to the pyridine moiety of the cyclometalating RCNCR ligand. The low-energy emission bands are ascribed to origins mainly derived from the intraligand π-π* states with an aryl to pyridine charge transfer character of the cyclometalating RCNCR ligand. Copyright © 2009 American Chemical Society.

Original languageEnglish
Pages (from-to)9076-9085
JournalJournal of the American Chemical Society
Volume131
Issue number25
DOIs
Publication statusPublished - 01 Jul 2009

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Electrochemistry
Ligands
Pyridine
Charge transfer
Methylene Chloride
Dichloromethane
Energy absorption
Electron transitions
Luminescence
Gold
Absorption spectra
Crystal structure
X-Rays
X rays
Oxidation
Temperature
carbene
pyridine

Citation

Au, V. K.-M., Wong, K. M.-C., Zhu, N., & Yam, V. W.-W. (2009). Luminescent cyclometalated N-heterocyclic carbene-containing organogold(III) complexes: Synthesis, characterization, electrochemistry, and photophysical studies. Journal of the American Chemical Society, 131(25), 9076-9085. doi: 10.1021/ja9027692