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Article: Unusual luminescence enhancement of metallogels of alkynylplatinum(II) 2,6-bis(N-alkylbenzimidazol-2′-yl)pyridine complexes upon a gel-to-sol phase transition at elevated temperatures

TitleUnusual luminescence enhancement of metallogels of alkynylplatinum(II) 2,6-bis(N-alkylbenzimidazol-2′-yl)pyridine complexes upon a gel-to-sol phase transition at elevated temperatures
Authors
Issue Date2009
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jacsat/index.html
Citation
Journal Of The American Chemical Society, 2009, v. 131 n. 17, p. 6253-6260 How to Cite?
AbstractA series of alkynylplatinum(II) complexes of 2,6-bis(N-alkylbenzimidazol- 2′-yl)pyridine has been synthesized and characterized by 1H NMR, IR, FAB mass spectrometry, and elemental analysis; the photophysical properties have also been investigated. All the complexes have been shown to exhibit interesting gelation properties. Scanning electron microscopy (SEM) of the xerogels showed a network of fibrous structures, typical of morphologies of organogels/metallogels. Interestingly, two of the complexes were found to show strong luminescence enhancement upon a gel-to-sol phase transition upon increasing the temperature. This unusual behavior is rarely encountered, as it represents a sharp contrast to that exhibited by other typical thermotropic organogels and metallogels reported so far. Variable-temperature UV-vis and luminescence spectroscopies were performed to probe the gel-to-sol phase transition. Concentration-dependent, variable-temperature, and time-resolved emission studies in dilute benzene solution have also been made to provide further insights into the spectroscopic origin in the sol forms. A quantitative treatment of the system based on the Birks scheme has been performed. © 2009 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/58378
ISSN
2015 Impact Factor: 13.038
2015 SCImago Journal Rankings: 7.123
ISI Accession Number ID
Funding AgencyGrant Number
The University of Hong Kong
URC Strategic Research Theme on Molecular Materials
RGC Central Allocation Vote (CAV)HKU 2/05C
National Natural Science Foundation of China
Research Grants Council of Hong Kong Joint Research SchemeN_HKU 737/06
Funding Information:

VW.-W.Y. acknowledges support from The University of Hong Kong under the Distinguished Research Achievement Award Scheme and the URC Strategic Research Theme on Molecular Materials. This work has been supported by the RGC Central Allocation Vote (CAV) Grant (HKU 2/05C), and the National Natural Science Foundation of China and the Research Grants Council of Hong Kong Joint Research Scheme (NSFC-RGC Project No. N_HKU 737/06). A.Y.-Y.T. acknowledges the receipt of a postgraduate studentship, administered by The University of Hong Kong. We also thank Mr. Frankie Yu-Fee Chan at the Electron Microscope Unit of The University of Hong Kong for helpful technical assistance.

References
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DC FieldValueLanguage
dc.contributor.authorTam, AYYen_HK
dc.contributor.authorWong, KMCen_HK
dc.contributor.authorYam, VWWen_HK
dc.date.accessioned2010-05-31T03:29:15Z-
dc.date.available2010-05-31T03:29:15Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal Of The American Chemical Society, 2009, v. 131 n. 17, p. 6253-6260en_HK
dc.identifier.issn0002-7863en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58378-
dc.description.abstractA series of alkynylplatinum(II) complexes of 2,6-bis(N-alkylbenzimidazol- 2′-yl)pyridine has been synthesized and characterized by 1H NMR, IR, FAB mass spectrometry, and elemental analysis; the photophysical properties have also been investigated. All the complexes have been shown to exhibit interesting gelation properties. Scanning electron microscopy (SEM) of the xerogels showed a network of fibrous structures, typical of morphologies of organogels/metallogels. Interestingly, two of the complexes were found to show strong luminescence enhancement upon a gel-to-sol phase transition upon increasing the temperature. This unusual behavior is rarely encountered, as it represents a sharp contrast to that exhibited by other typical thermotropic organogels and metallogels reported so far. Variable-temperature UV-vis and luminescence spectroscopies were performed to probe the gel-to-sol phase transition. Concentration-dependent, variable-temperature, and time-resolved emission studies in dilute benzene solution have also been made to provide further insights into the spectroscopic origin in the sol forms. A quantitative treatment of the system based on the Birks scheme has been performed. © 2009 American Chemical Society.en_HK
dc.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jacsat/index.htmlen_HK
dc.relation.ispartofJournal of the American Chemical Societyen_HK
dc.titleUnusual luminescence enhancement of metallogels of alkynylplatinum(II) 2,6-bis(N-alkylbenzimidazol-2′-yl)pyridine complexes upon a gel-to-sol phase transition at elevated temperaturesen_HK
dc.typeArticleen_HK
dc.identifier.emailWong, KMC:wongmc@hku.hken_HK
dc.identifier.emailYam, VWW:wwyam@hku.hken_HK
dc.identifier.authorityWong, KMC=rp00809en_HK
dc.identifier.authorityYam, VWW=rp00822en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/ja900895xen_HK
dc.identifier.pmid19354251-
dc.identifier.scopuseid_2-s2.0-70149099348en_HK
dc.identifier.hkuros158348en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70149099348&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume131en_HK
dc.identifier.issue17en_HK
dc.identifier.spage6253en_HK
dc.identifier.epage6260en_HK
dc.identifier.eissn1520-5126-
dc.identifier.isiWOS:000265755800051-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectSynthesis, aggregation and self-assembly of luminescent functional molecules - from solutions to polymers, ordered thin films, inorganic-organic hybrids, and supramolecular and nano-assemblies-
dc.relation.projectCarbon-rich metal-containing molecular and nano-scale functional materials-
dc.identifier.scopusauthoridTam, AYY=16643873800en_HK
dc.identifier.scopusauthoridWong, KMC=8061067200en_HK
dc.identifier.scopusauthoridYam, VWW=18539304700en_HK

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