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Article: Electrochemical, photophysical, and anion-binding properties of a luminescent rhenium(I) polypyridine anthraquinone complex with a thiourea receptor

TitleElectrochemical, photophysical, and anion-binding properties of a luminescent rhenium(I) polypyridine anthraquinone complex with a thiourea receptor
Authors
Issue Date2004
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/organometallics
Citation
Organometallics, 2004, v. 23 n. 5, p. 1098-1106 How to Cite?
AbstractWe report the synthesis, characterization, and electrochemical and photophysical properties of a new luminescent rhenium(I) polypyridine-thiourea-anthraquinone complex, [Re(Me4-phen)(CO)3(Py-An)](CF3SO3) (1), and its anthraquinone-free analogue [Re(Me4-phen)(CO)3(Py-Ph)](CF3SO3) (2) (Me4-phen = 3,4,7,8-tetramethyl-1,10-phenanthroline; Py-An = N-(1-anthraquinonyl)-N′-(4-pyridinylmethyl)thiourea; Py-Ph = N-(1-phenyl)-N′-(4-pyridinylmethyl)thiourea)). The crystal structure of complex 2 has been studied by X-ray crystallography. Upon irradiation, both complexes 1 and 2 show intense and long-lived green luminescence in fluid solutions at 298 K and in alcohol glass at 77 K. The emission is assigned to an excited state of triplet metal-to-ligand charge-transfer 3MLCT (dπ(Re) → π*(Me4-phen)) character. In low-temperature glass, biexponential decays are observed for both complexes 1 and 2, and the longer- and shorter-lived components are assigned to 3IL (π → π*)(Me4-phen) and 3MLCT (dπ(Re) → π*(Me4-phen)) excited states, respectively. The binding of anions to complexes 1 and 2 has been investigated by electronic absorption and emission titrations. Of the six anions we have studied (fluoride, acetate, dihydrogen phosphate, iodide, hydrogen sulfate, and nitrate), complexes 1 and 2 can recognize F-, OAc-, and H2PO4 -, with log Ks values ranging from ca. 3.53 to 4.94. While the anion-binding properties of complex 2 can only be reflected by its emission spectral changes, both the absorption and emission spectra of complex 1 display significant changes upon binding of anions, as a result of the additional anthraquinone unit.
Persistent Identifierhttp://hdl.handle.net/10722/69332
ISSN
2015 Impact Factor: 4.186
2015 SCImago Journal Rankings: 2.043
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLo, KKWen_HK
dc.contributor.authorLau, JSYen_HK
dc.contributor.authorFong, VWYen_HK
dc.contributor.authorZhu, Nen_HK
dc.date.accessioned2010-09-06T06:12:41Z-
dc.date.available2010-09-06T06:12:41Z-
dc.date.issued2004en_HK
dc.identifier.citationOrganometallics, 2004, v. 23 n. 5, p. 1098-1106en_HK
dc.identifier.issn0276-7333en_HK
dc.identifier.urihttp://hdl.handle.net/10722/69332-
dc.description.abstractWe report the synthesis, characterization, and electrochemical and photophysical properties of a new luminescent rhenium(I) polypyridine-thiourea-anthraquinone complex, [Re(Me4-phen)(CO)3(Py-An)](CF3SO3) (1), and its anthraquinone-free analogue [Re(Me4-phen)(CO)3(Py-Ph)](CF3SO3) (2) (Me4-phen = 3,4,7,8-tetramethyl-1,10-phenanthroline; Py-An = N-(1-anthraquinonyl)-N′-(4-pyridinylmethyl)thiourea; Py-Ph = N-(1-phenyl)-N′-(4-pyridinylmethyl)thiourea)). The crystal structure of complex 2 has been studied by X-ray crystallography. Upon irradiation, both complexes 1 and 2 show intense and long-lived green luminescence in fluid solutions at 298 K and in alcohol glass at 77 K. The emission is assigned to an excited state of triplet metal-to-ligand charge-transfer 3MLCT (dπ(Re) → π*(Me4-phen)) character. In low-temperature glass, biexponential decays are observed for both complexes 1 and 2, and the longer- and shorter-lived components are assigned to 3IL (π → π*)(Me4-phen) and 3MLCT (dπ(Re) → π*(Me4-phen)) excited states, respectively. The binding of anions to complexes 1 and 2 has been investigated by electronic absorption and emission titrations. Of the six anions we have studied (fluoride, acetate, dihydrogen phosphate, iodide, hydrogen sulfate, and nitrate), complexes 1 and 2 can recognize F-, OAc-, and H2PO4 -, with log Ks values ranging from ca. 3.53 to 4.94. While the anion-binding properties of complex 2 can only be reflected by its emission spectral changes, both the absorption and emission spectra of complex 1 display significant changes upon binding of anions, as a result of the additional anthraquinone unit.en_HK
dc.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/organometallicsen_HK
dc.relation.ispartofOrganometallicsen_HK
dc.titleElectrochemical, photophysical, and anion-binding properties of a luminescent rhenium(I) polypyridine anthraquinone complex with a thiourea receptoren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0276-7333&volume=23&spage=1098&epage=1106&date=2004&atitle=Electrochemical,+photophysical,+and+anion-binding+properties+of+a+luminescent+rhenium(I)+polypyridine+anthraquinone+complex+with+a+thiourea+receptoren_HK
dc.identifier.emailZhu, N: nzhu@hkucc.hku.hken_HK
dc.identifier.authorityZhu, N=rp00845en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/om034224cen_HK
dc.identifier.scopuseid_2-s2.0-1542647156en_HK
dc.identifier.hkuros90962en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1542647156&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume23en_HK
dc.identifier.issue5en_HK
dc.identifier.spage1098en_HK
dc.identifier.epage1106en_HK
dc.identifier.isiWOS:000189168800023-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLo, KKW=26032181200en_HK
dc.identifier.scopusauthoridLau, JSY=13805764500en_HK
dc.identifier.scopusauthoridFong, VWY=6602133035en_HK
dc.identifier.scopusauthoridZhu, N=7201449530en_HK

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