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Article: Photophysical and electrochemical properties of platinum(II) complexes bearing a chromophore-acceptor dyad and their photocatalytic hydrogen evolution

TitlePhotophysical and electrochemical properties of platinum(II) complexes bearing a chromophore-acceptor dyad and their photocatalytic hydrogen evolution
Authors
Issue Date2012
PublisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/dalton
Citation
Dalton Transactions, 2012, v. 41 n. 27, p. 8421-8429 How to Cite?
Abstract
A series of platinum(II) complexes bearing a chromophore-acceptor dyad obtained by reacting 4-(p-bromomethylphenyl)-6-phenyl-2,2′-bipyridine or 4′-(p-bromomethylphenyl)-2,2′:6′,2′′-terpyridine with pyridine, 4-phenylpyridine, 4,4′-bipyridine, 1-methyl-4-(pyridin- 4′-yl)pyridinium hexafluorophosphate respectively, were synthesized. Their photophysical properties, emission quenching studies by Pt nanoparticles and methyl viologen, electrochemical properties and photoinduced electron-transfer reactions in a photocatalytic hydrogen-generating system containing triethanolamine and colloidal Pt without an extra electron relay, were investigated. A comparison of the rates of hydrogen production for the two photocatalytic systems, one containing a metal-organic dyad and the other comprising a 1:1 mixture of the parental platinum(II) complexes and the corresponding electron relay, showed that intramolecular electron transfer improves the photocatalytic efficiency. Compared with cyclometalated platinum(II) complexes, the related platinum(II) terpyridyl complexes exhibited poor performance for photocatalytic hydrogen evolution. An investigation into the amount of hydrogen generated by three platinum(II) complexes containing cyclometalated ligands with methyl groups located on different phenyl rings revealed that the efficiency of hydrogen evolution was affected by a subtle change of functional group on ligand, and the hydrogen-generating efficiency in the presence or absence of methyl viologen is comparable, indicating electron transfer from the excited [Pt(C^N^N)] chromophore to colloidal Pt. 1H NMR spectroscopy of the metal-organic dyads in an aqueous solution in the presence of excess triethanolamine revealed that the dyad with a viologen unit was unstable, and a chemical reaction in the compound occurred prior to irradiation by visible light under basic conditions. © The Royal Society of Chemistry 2012.
Persistent Identifierhttp://hdl.handle.net/10722/168639
ISSN
2013 Impact Factor: 4.097
ISI Accession Number ID
References

 

Author Affiliations
  1. The University of Hong Kong
  2. Technical Institute of Physics and Chemistry Chinese Academy of Sciences
  3. Yunnan Normal University
DC FieldValueLanguage
dc.contributor.authorZhang, GJen_HK
dc.contributor.authorGan, Xen_HK
dc.contributor.authorXu, QQen_HK
dc.contributor.authorChen, Yen_HK
dc.contributor.authorZhao, XJen_HK
dc.contributor.authorQin, Ben_HK
dc.contributor.authorLv, XJen_HK
dc.contributor.authorLai, SWen_HK
dc.contributor.authorFu, WFen_HK
dc.contributor.authorChe, CMen_HK
dc.date.accessioned2012-10-08T03:23:49Z-
dc.date.available2012-10-08T03:23:49Z-
dc.date.issued2012en_HK
dc.identifier.citationDalton Transactions, 2012, v. 41 n. 27, p. 8421-8429en_HK
dc.identifier.issn1477-9226en_HK
dc.identifier.urihttp://hdl.handle.net/10722/168639-
dc.description.abstractA series of platinum(II) complexes bearing a chromophore-acceptor dyad obtained by reacting 4-(p-bromomethylphenyl)-6-phenyl-2,2′-bipyridine or 4′-(p-bromomethylphenyl)-2,2′:6′,2′′-terpyridine with pyridine, 4-phenylpyridine, 4,4′-bipyridine, 1-methyl-4-(pyridin- 4′-yl)pyridinium hexafluorophosphate respectively, were synthesized. Their photophysical properties, emission quenching studies by Pt nanoparticles and methyl viologen, electrochemical properties and photoinduced electron-transfer reactions in a photocatalytic hydrogen-generating system containing triethanolamine and colloidal Pt without an extra electron relay, were investigated. A comparison of the rates of hydrogen production for the two photocatalytic systems, one containing a metal-organic dyad and the other comprising a 1:1 mixture of the parental platinum(II) complexes and the corresponding electron relay, showed that intramolecular electron transfer improves the photocatalytic efficiency. Compared with cyclometalated platinum(II) complexes, the related platinum(II) terpyridyl complexes exhibited poor performance for photocatalytic hydrogen evolution. An investigation into the amount of hydrogen generated by three platinum(II) complexes containing cyclometalated ligands with methyl groups located on different phenyl rings revealed that the efficiency of hydrogen evolution was affected by a subtle change of functional group on ligand, and the hydrogen-generating efficiency in the presence or absence of methyl viologen is comparable, indicating electron transfer from the excited [Pt(C^N^N)] chromophore to colloidal Pt. 1H NMR spectroscopy of the metal-organic dyads in an aqueous solution in the presence of excess triethanolamine revealed that the dyad with a viologen unit was unstable, and a chemical reaction in the compound occurred prior to irradiation by visible light under basic conditions. © The Royal Society of Chemistry 2012.en_HK
dc.languageengen_US
dc.publisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/daltonen_HK
dc.relation.ispartofDalton Transactionsen_HK
dc.titlePhotophysical and electrochemical properties of platinum(II) complexes bearing a chromophore-acceptor dyad and their photocatalytic hydrogen evolutionen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y: yongchen@hku.hken_HK
dc.identifier.emailLai, SW: swlai@hku.hken_HK
dc.identifier.emailChe, CM: cmche@hku.hken_HK
dc.identifier.authorityChen, Y=rp00674en_HK
dc.identifier.authorityLai, SW=rp00717en_HK
dc.identifier.authorityChe, CM=rp00670en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1039/c2dt30415een_HK
dc.identifier.pmid22643575-
dc.identifier.scopuseid_2-s2.0-84862866141en_HK
dc.identifier.hkuros219329-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84862866141&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume41en_HK
dc.identifier.issue27en_HK
dc.identifier.spage8421en_HK
dc.identifier.epage8429en_HK
dc.identifier.isiWOS:000305476100024-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhang, GJ=54882577600en_HK
dc.identifier.scopusauthoridGan, X=7103333665en_HK
dc.identifier.scopusauthoridXu, QQ=19639533600en_HK
dc.identifier.scopusauthoridChen, Y=15134748900en_HK
dc.identifier.scopusauthoridZhao, XJ=8328189400en_HK
dc.identifier.scopusauthoridQin, B=55263842000en_HK
dc.identifier.scopusauthoridLv, XJ=25641473900en_HK
dc.identifier.scopusauthoridLai, SW=7402937200en_HK
dc.identifier.scopusauthoridFu, WF=7202947315en_HK
dc.identifier.scopusauthoridChe, CM=7102442791en_HK

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