Article: Diarylethene-containing cyclometalated platinum(II) complexes: Tunable photochromism via metal coordination and rational ligand design

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TitleDiarylethene-containing cyclometalated platinum(II) complexes: Tunable photochromism via metal coordination and rational ligand design
AuthorsChan, JCH1
Lam, WH1
Wong, HL1
Zhu, N1
Wong, WT1
Yam, VWW1
Issue Date2011
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jacsat/index.html
CitationJournal Of The American Chemical Society, 2011, v. 133 n. 32, p. 12690-12705 [How to Cite?]
DOI: http://dx.doi.org/10.1021/ja203946g
AbstractThe synthesis, characterization, electrochemistry, photophysics and photochromic behavior of a new class of cyclometalated platinum(II) complexes [Pt(C ∧N)(O ∧O)] (1a-5a and 1b-5b), where C ∧N is a cyclometalating 2-(2′-thienyl)pyridyl (thpy) or 2-(2′-thienothienyl)pyridyl (tthpy) ligand containing the photochromic dithienylethene (DTE) unit and O ∧O is a β-diketonato ligand of acetylacetonato (acac) or hexafluoroacetylacetonato (hfac), have been reported. The X-ray crystal structures of five of the complexes have also been determined. The electrochemical studies reveal that the first quasi-reversible reduction couple, and hence the nature of lowest unoccupied molecular orbital (LUMO) of the complexes, is sensitive to the nature of the ancillary O ∧O ligands. Upon photoexcitation, complexes 1a-3a and 1b-3b exhibit drastic color changes, ascribed to the reversible photochromic behavior, which is found to be sensitive to the substituents on the pyridyl ring and the extent of π-conjugation of the C ∧N ligand as well as the nature of the ancillary ligand. The thermal bleaching kinetics of complex 1a has been studied in toluene at various temperatures, and the activation barrier for the thermal cycloreversion of the complex has been determined. Density functional theory (DFT) calculations have been performed to provide an insight into the electrochemical, photophysical and photochromic properties. © 2011 American Chemical Society.
ISSN0002-7863
2011 Impact Factor: 9.907
2011 SCImago Journal Rankings: 1.117
DOIhttp://dx.doi.org/10.1021/ja203946g
ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorChan, JCH
dc.contributor.authorLam, WH
dc.contributor.authorWong, HL
dc.contributor.authorZhu, N
dc.contributor.authorWong, WT
dc.contributor.authorYam, VWW
dc.date.accessioned2012-08-16T05:48:44Z
dc.date.available2012-08-16T05:48:44Z
dc.date.issued2011
dc.description.abstractThe synthesis, characterization, electrochemistry, photophysics and photochromic behavior of a new class of cyclometalated platinum(II) complexes [Pt(C ∧N)(O ∧O)] (1a-5a and 1b-5b), where C ∧N is a cyclometalating 2-(2′-thienyl)pyridyl (thpy) or 2-(2′-thienothienyl)pyridyl (tthpy) ligand containing the photochromic dithienylethene (DTE) unit and O ∧O is a β-diketonato ligand of acetylacetonato (acac) or hexafluoroacetylacetonato (hfac), have been reported. The X-ray crystal structures of five of the complexes have also been determined. The electrochemical studies reveal that the first quasi-reversible reduction couple, and hence the nature of lowest unoccupied molecular orbital (LUMO) of the complexes, is sensitive to the nature of the ancillary O ∧O ligands. Upon photoexcitation, complexes 1a-3a and 1b-3b exhibit drastic color changes, ascribed to the reversible photochromic behavior, which is found to be sensitive to the substituents on the pyridyl ring and the extent of π-conjugation of the C ∧N ligand as well as the nature of the ancillary ligand. The thermal bleaching kinetics of complex 1a has been studied in toluene at various temperatures, and the activation barrier for the thermal cycloreversion of the complex has been determined. Density functional theory (DFT) calculations have been performed to provide an insight into the electrochemical, photophysical and photochromic properties. © 2011 American Chemical Society.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationJournal Of The American Chemical Society, 2011, v. 133 n. 32, p. 12690-12705 [How to Cite?]
DOI: http://dx.doi.org/10.1021/ja203946g
dc.identifier.doihttp://dx.doi.org/10.1021/ja203946g
dc.identifier.epage12705
dc.identifier.hkuros204389
dc.identifier.issn0002-7863
2011 Impact Factor: 9.907
2011 SCImago Journal Rankings: 1.117
dc.identifier.issue32
dc.identifier.pmid21780780
dc.identifier.scopuseid_2-s2.0-80051589080
dc.identifier.spage12690
dc.identifier.urihttp://hdl.handle.net/10722/159335
dc.identifier.volume133
dc.languageeng
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jacsat/index.html
dc.publisher.placeUnited States
dc.relation.ispartofJournal of the American Chemical Society
dc.relation.referencesReferences in Scopus
dc.titleDiarylethene-containing cyclometalated platinum(II) complexes: Tunable photochromism via metal coordination and rational ligand design
dc.typeArticle
Author Affiliations
  1. The University of Hong Kong