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Issue 31, 2014
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Luminescent monocyclometalated cationic gold(III) complexes: synthesis, photophysical characterization and catalytic investigations

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Abstract

Stable, luminescent, and cationic monocyclometalated gold(III) monoaryl complexes of the type [(ppy)Au(FMes)(L)]+[OTf] [L = 4-phenylpyridine (3), quinoline (4), 4-fluoroaniline (5), P(OMe)3 (6), PPh3 (7)], bearing different ancillary ligands, synthesized starting from the precursor complex [(ppy)Au(FMes)(OH2)]+[OTf] (2) are reported. The preliminary assignment of the structure of the complexes by various nuclear magnetic resonance spectroscopy techniques and elemental analysis has been further corroborated by single-crystal X-ray diffraction studies. The complexes exhibit room temperature phosphorescence in solution, in neat solids and in doped PMMA films. Detailed photophysical investigations of the complexes in solution, in neat solids and in PMMA films revealed the successful tuning of the emission quantum yield (ϕp) based on the electronic properties of the ancillary ligands. The catalytic photo-oxidation of benzylic amines to their corresponding imines using molecular oxygen as the oxidant was successfully achieved in the presence of the luminescent Au(III) complexes. It is also established that the photocatalytic performance was strongly governed by the electronic properties of the ancillary ligands on the photosensitizer as well as by the steric bulk of the substrates.

Graphical abstract: Luminescent monocyclometalated cationic gold(iii) complexes: synthesis, photophysical characterization and catalytic investigations

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Publication details

The article was received on 23 Apr 2014, accepted on 12 Jun 2014 and first published on 12 Jun 2014


Article type: Paper
DOI: 10.1039/C4DT01187B
Dalton Trans., 2014,43, 11959-11972
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    Luminescent monocyclometalated cationic gold(III) complexes: synthesis, photophysical characterization and catalytic investigations

    T. N. Zehnder, O. Blacque and K. Venkatesan, Dalton Trans., 2014, 43, 11959
    DOI: 10.1039/C4DT01187B

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