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Article: Luminescent cyclometalated dialkynylgold(III) complexes of 2-phenylpyridine-type derivatives with readily tunable emission properties

TitleLuminescent cyclometalated dialkynylgold(III) complexes of 2-phenylpyridine-type derivatives with readily tunable emission properties
Authors
Keywordsacetylides
cyclometalation
excited states
gold
luminescence
Issue Date2011
PublisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/chemistry
Citation
Chemistry - A European Journal, 2011, v. 17 n. 1, p. 130-142 How to Cite?
AbstractA 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.
Persistent Identifierhttp://hdl.handle.net/10722/133593
ISSN
2015 Impact Factor: 5.771
2015 SCImago Journal Rankings: 2.323
ISI Accession Number ID
Funding AgencyGrant Number
The University of Hong Kong
World Gold Council
URC Strategic Research Theme on Molecular Materials
University Grants Committee (UGC) Areas of Excellence SchemeAoE/P-03/08
SEG_HKU07
Innovation and Technology Fund (ITF)ITS/142/08
Funding Information:

V.W.-W.Y. acknowledges support from The University of Hong Kong under the Distinguished Research Achievement Award Scheme, the World Gold Council GROW Programme, and the URC Strategic Research Theme on Molecular Materials. This work has been supported by the University Grants Committee (UGC) Areas of Excellence Scheme (AoE/P-03/08), the UGC Special Equipment Grant (SEG_HKU07), and the Innovation and Technology Fund (ITF Tier 3 Project ITS/142/08). V.K.-M.A. acknowledges the receipt of a postgraduate studentship from The University of Hong Kong.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorAu, VKMen_HK
dc.contributor.authorWong, KMCen_HK
dc.contributor.authorZhu, Nen_HK
dc.contributor.authorYam, VWWen_HK
dc.date.accessioned2011-05-24T02:11:33Z-
dc.date.available2011-05-24T02:11:33Z-
dc.date.issued2011en_HK
dc.identifier.citationChemistry - A European Journal, 2011, v. 17 n. 1, p. 130-142en_HK
dc.identifier.issn0947-6539en_HK
dc.identifier.urihttp://hdl.handle.net/10722/133593-
dc.description.abstractA 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.en_HK
dc.languageengen_US
dc.publisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/chemistryen_HK
dc.relation.ispartofChemistry - A European Journalen_HK
dc.rightsPreprint This is the pre-peer reviewed version of the following article: FULL CITE, which has been published in final form at [Link to final article].-
dc.subjectacetylidesen_HK
dc.subjectcyclometalationen_HK
dc.subjectexcited statesen_HK
dc.subjectgolden_HK
dc.subjectluminescenceen_HK
dc.titleLuminescent cyclometalated dialkynylgold(III) complexes of 2-phenylpyridine-type derivatives with readily tunable emission propertiesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0947-6539&volume=17&issue=1&spage=130&epage=142&date=2011&atitle=Luminescent+cyclometalated+dialkynylgold(III)+complexes+of+2-phenylpyridine-type+derivatives+with+readily+tunable+emission+properties-
dc.identifier.emailWong, KMC: wongmc@hku.hken_HK
dc.identifier.emailZhu, N: nzhu@hkucc.hku.hken_HK
dc.identifier.emailYam, VWW: wwyam@hku.hken_HK
dc.identifier.authorityWong, KMC=rp00809en_HK
dc.identifier.authorityZhu, N=rp00845en_HK
dc.identifier.authorityYam, VWW=rp00822en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/chem.201001965en_HK
dc.identifier.pmid20967907-
dc.identifier.scopuseid_2-s2.0-78650973873en_HK
dc.identifier.hkuros185268en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78650973873&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume17en_HK
dc.identifier.issue1en_HK
dc.identifier.spage130en_HK
dc.identifier.epage142en_HK
dc.identifier.isiWOS:000286682900015-
dc.publisher.placeGermanyen_HK
dc.relation.projectDevelopment of Gold(III)-containing Triplet Light-emitting Materials and Their Application Studies in the Fabrication of OLEDs and WOLEDs-
dc.relation.projectIntegrated Time-Resolved Spectroscopy Facility-
dc.relation.projectInstitute of Molecular Functional Materials-
dc.identifier.scopusauthoridAu, VKM=26421974800en_HK
dc.identifier.scopusauthoridWong, KMC=8061067200en_HK
dc.identifier.scopusauthoridZhu, N=7201449530en_HK
dc.identifier.scopusauthoridYam, VWW=18539304700en_HK

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