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|Title:||Luminescent cyclometalated dialkynylgold(III) complexes of 2-phenylpyridine-type derivatives with readily tunable emission properties|
|Publisher:||Wiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/chemistry;Germany|
|Description:||A novel class of luminescent dialkynylgold(III) complexes containing various phenylpyridine and phenylisoquinoline-type bidentate ligands has been successfully synthesized and characterized. The structures of some of them have also been determined by X-ray crystallography. Electrochemical studies demonstrate the presence of a ligand-centered reduction originating from the cyclometalating C^N ligand, whereas the first oxidation wave is associated with an alkynyl ligand-centered oxidation. The electronic absorption and photoluminescence properties of the complexes have also been investigated. In dichloromethane solution at room temperature, the low-energy absorption bands are assigned as the metal-perturbed π-π* intraligand (IL) transition of the cyclometalating C^N ligand, with mixing of charge-transfer character from the aryl ring to the pyridine or isoquinoline moieties of the cyclometalating C^N ligand. The low-energy emission bands of the complexes in fluid solution at room temperature are ascribed to originate from the metal-perturbed π-π* IL transition of the cyclometalatng C^N ligand. For complex 4 that contains an electron-rich amino substituent on the alkynyl ligand, a structureless emission band, instead of one with vibronic structures as in the other complexes, was observed, which was assigned as being derived from an excited state of a [π(Cï£CC 6H 4NH 2)→π (C^N)] ligand-to-ligand charge-transfer (LLCT) transition. Luminescence enhancement: A novel class of luminescent dialkynylgold(III) complexes containing various phenylpyridine- and phenylisoquinoline-type bidentate ligands has been successfully synthesized and characterized. This class of complexes has been shown to demonstrate rich and tunable photoluminescence properties (see picture). © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.;link_to_subscribed_fulltext|
|Other Identifiers:||Chemistry - A European Journal, 2011, v. 17 n. 1, p. 130-142|
|Type Of Material:||Article|
|Appears in Collections:||Department of Chemistry|
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