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Article: Luminescent cyclometallated rhodium(III) bis(pyridylbenzaldehyde) complexes with long-lived excited states

TitleLuminescent cyclometallated rhodium(III) bis(pyridylbenzaldehyde) complexes with long-lived excited states
Authors
Issue Date2003
PublisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/dalton
Citation
Dalton Transactions, 2003 n. 24, p. 4682-4689 How to Cite?
AbstractA series of luminescent cyclometallated rhodium(III) diimine complexes containing two aldehyde functional groups [Rh(pba)2(N-N)]Cl (Hpba = 4-(2-pyridyl)benzaldehyde; N-N = 2,2′-bipyridine, bpy (2); 4,4′-dimethyl-2,2′-bipyridine, 4,4′-Me2bpy (3); 1,10-phenanthroline, phen (4); 3,4,7,8-tetramethyl-1,10-phenanthroline, 3,4,7,8-Me4phen (5); 4,7-diphenyl-1,10-phenanthroline, 4,7-Ph2phen (6)) have been synthesised, and their photophysical and electrochemical properties investigated. The X-ray crystal structures of complexes 3, 4 and the precursor complex, [Rh2(pba)4Cl2] (1), have also been determined. Upon photoexcitation, complexes 2-6 display long-lived emission in solutions at 298 K and in low-temperature glass. Remarkably, the luminescence lifetimes of the complexes in solutions at 298 K are extraordinarily long (ca. 4.2-8.7 μs). To the best of our knowledge, there is no precedent for such long emission lifetimes observed in other related cyclometallated rhodium(III) systems. The solution emission spectra show structured bands with emission maxima at ca. 506 nm. The emission is tentatively assigned to an excited state of triplet intra-ligand 3IL (π → π*)(pba-) character, probably mixed with some triplet metal-to-ligand charge-transfer 3MLCT (dπ(Rh) → π* (pba-)) character. On the basis of the facile reaction between the aldehyde group and the primary amine group, to form a secondary amine after reductive amination, complexes 2-6 have been used to label the protein bovine serum albumin. The photophysical properties of the bioconjugates have also been investigated.
Persistent Identifierhttp://hdl.handle.net/10722/70260
ISSN
2015 Impact Factor: 4.177
2015 SCImago Journal Rankings: 1.404
References

 

DC FieldValueLanguage
dc.contributor.authorLo, KKWen_HK
dc.contributor.authorLi, CKen_HK
dc.contributor.authorLau, KWen_HK
dc.contributor.authorZhu, Nen_HK
dc.date.accessioned2010-09-06T06:21:13Z-
dc.date.available2010-09-06T06:21:13Z-
dc.date.issued2003en_HK
dc.identifier.citationDalton Transactions, 2003 n. 24, p. 4682-4689en_HK
dc.identifier.issn1477-9226en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70260-
dc.description.abstractA series of luminescent cyclometallated rhodium(III) diimine complexes containing two aldehyde functional groups [Rh(pba)2(N-N)]Cl (Hpba = 4-(2-pyridyl)benzaldehyde; N-N = 2,2′-bipyridine, bpy (2); 4,4′-dimethyl-2,2′-bipyridine, 4,4′-Me2bpy (3); 1,10-phenanthroline, phen (4); 3,4,7,8-tetramethyl-1,10-phenanthroline, 3,4,7,8-Me4phen (5); 4,7-diphenyl-1,10-phenanthroline, 4,7-Ph2phen (6)) have been synthesised, and their photophysical and electrochemical properties investigated. The X-ray crystal structures of complexes 3, 4 and the precursor complex, [Rh2(pba)4Cl2] (1), have also been determined. Upon photoexcitation, complexes 2-6 display long-lived emission in solutions at 298 K and in low-temperature glass. Remarkably, the luminescence lifetimes of the complexes in solutions at 298 K are extraordinarily long (ca. 4.2-8.7 μs). To the best of our knowledge, there is no precedent for such long emission lifetimes observed in other related cyclometallated rhodium(III) systems. The solution emission spectra show structured bands with emission maxima at ca. 506 nm. The emission is tentatively assigned to an excited state of triplet intra-ligand 3IL (π → π*)(pba-) character, probably mixed with some triplet metal-to-ligand charge-transfer 3MLCT (dπ(Rh) → π* (pba-)) character. On the basis of the facile reaction between the aldehyde group and the primary amine group, to form a secondary amine after reductive amination, complexes 2-6 have been used to label the protein bovine serum albumin. The photophysical properties of the bioconjugates have also been investigated.en_HK
dc.languageengen_HK
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.titleLuminescent cyclometallated rhodium(III) bis(pyridylbenzaldehyde) complexes with long-lived excited statesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1477-9226&volume=2003&issue=24&spage=4682&epage=4689&date=2003&atitle=Luminescent+cyclometallated+rhodium(III)+bis(pyridylbenzaldehyde)+complexes+with+long-lived+excited+states+en_HK
dc.identifier.emailZhu, N: nzhu@hkucc.hku.hken_HK
dc.identifier.authorityZhu, N=rp00845en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-1642460143en_HK
dc.identifier.hkuros91153en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1642460143&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.issue24en_HK
dc.identifier.spage4682en_HK
dc.identifier.epage4689en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLo, KKW=26032181200en_HK
dc.identifier.scopusauthoridLi, CK=15731020400en_HK
dc.identifier.scopusauthoridLau, KW=36722693900en_HK
dc.identifier.scopusauthoridZhu, N=7201449530en_HK

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