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Article: Synthesis of organoplatinum oligomers by employing N-donor bridges with predesigned geometry: Structural and photophysical properties of luminescent cyclometalated platinum(II) macrocycles

TitleSynthesis of organoplatinum oligomers by employing N-donor bridges with predesigned geometry: Structural and photophysical properties of luminescent cyclometalated platinum(II) macrocycles
Authors
Issue Date1999
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/organometallics
Citation
Organometallics, 1999, v. 18 n. 20, p. 3991-3997 How to Cite?
AbstractA series of luminescent di- and trimeric cyclometalated platinum(II) macrocycles, namely, [Pt(C-N)(N-N)]2 (N-N = pyrazolate, pz (2); 7-azaindolate, aza (3); C-N = 2-(2′-thienyl)-pyridyl, Thpy (a); 7,8-benzoquinolate, Bzqn (b); 2-phenylpyridyl, Phpy (c)) and [Pt(C-N)-(N-N)]3 (N-N = benzimidazolate, bzim (4); C-N = Thpy (a) and Bzqn (b)), are synthesized in high yields (70-90%). The rigid, predefined coordination geometry of the pz, aza, and bzim bridging ligands ensure the efficient and selective assembly of the respective cyclic oligomers. The stacking arrangements in the crystal structures of 1a and 4a reveal π-π interactions between 2-(2′-thienyl)pyridyl moieties. The lowest energy absorption band in the UV-vis spectra is assigned to metal-to-ligand charge transfer (MLCT) transitions. The 298 K fluid emissions of complexes 2-4a bearing Thpy ligands are assigned to transitions with mixed MLCT and IL (intraligand) character. In crystalline form, the observed red-shift is attributed to excimeric emission arising from π-stacking in the solid state. In contrast, a number of Bzqn derivatives are nonemissive in CH2Cl2 at 298 K. The energy of the lowest energy UV-vis and emissive bands for Thpy oligomers are red-shifted relative to the Bzqn and Phpy congeners. Significantly, Thpy complexes and especially the μ-pyrazolate species 2a (τo = 15.5 μs, Φo = 0.18) emit with longer lifetimes and higher quantum yields.
Persistent Identifierhttp://hdl.handle.net/10722/69425
ISSN
2015 Impact Factor: 4.186
2015 SCImago Journal Rankings: 2.043
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLai, SWen_HK
dc.contributor.authorChan, MCWen_HK
dc.contributor.authorCheung, KKen_HK
dc.contributor.authorPeng, SMen_HK
dc.contributor.authorChe, CMen_HK
dc.date.accessioned2010-09-06T06:13:33Z-
dc.date.available2010-09-06T06:13:33Z-
dc.date.issued1999en_HK
dc.identifier.citationOrganometallics, 1999, v. 18 n. 20, p. 3991-3997en_HK
dc.identifier.issn0276-7333en_HK
dc.identifier.urihttp://hdl.handle.net/10722/69425-
dc.description.abstractA series of luminescent di- and trimeric cyclometalated platinum(II) macrocycles, namely, [Pt(C-N)(N-N)]2 (N-N = pyrazolate, pz (2); 7-azaindolate, aza (3); C-N = 2-(2′-thienyl)-pyridyl, Thpy (a); 7,8-benzoquinolate, Bzqn (b); 2-phenylpyridyl, Phpy (c)) and [Pt(C-N)-(N-N)]3 (N-N = benzimidazolate, bzim (4); C-N = Thpy (a) and Bzqn (b)), are synthesized in high yields (70-90%). The rigid, predefined coordination geometry of the pz, aza, and bzim bridging ligands ensure the efficient and selective assembly of the respective cyclic oligomers. The stacking arrangements in the crystal structures of 1a and 4a reveal π-π interactions between 2-(2′-thienyl)pyridyl moieties. The lowest energy absorption band in the UV-vis spectra is assigned to metal-to-ligand charge transfer (MLCT) transitions. The 298 K fluid emissions of complexes 2-4a bearing Thpy ligands are assigned to transitions with mixed MLCT and IL (intraligand) character. In crystalline form, the observed red-shift is attributed to excimeric emission arising from π-stacking in the solid state. In contrast, a number of Bzqn derivatives are nonemissive in CH2Cl2 at 298 K. The energy of the lowest energy UV-vis and emissive bands for Thpy oligomers are red-shifted relative to the Bzqn and Phpy congeners. Significantly, Thpy complexes and especially the μ-pyrazolate species 2a (τo = 15.5 μs, Φo = 0.18) emit with longer lifetimes and higher quantum yields.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.titleSynthesis of organoplatinum oligomers by employing N-donor bridges with predesigned geometry: Structural and photophysical properties of luminescent cyclometalated platinum(II) macrocyclesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0276-7333&volume=18&spage=3991&epage=3997&date=1999&atitle=Synthesis+of+organoplatinum+oligomers+by+employing+N-donor+bridges+with+predesigned+geometry:+structural+and+photophysical+properties+of+luminescent+cyclometalated+platinum(II)+macrocyclesen_HK
dc.identifier.emailLai, SW: swlai@hku.hken_HK
dc.identifier.emailChe, CM: cmche@hku.hken_HK
dc.identifier.authorityLai, SW=rp00717en_HK
dc.identifier.authorityChe, CM=rp00670en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/om990342h-
dc.identifier.scopuseid_2-s2.0-0001531035en_HK
dc.identifier.hkuros53183en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0001531035&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume18en_HK
dc.identifier.issue20en_HK
dc.identifier.spage3991en_HK
dc.identifier.epage3997en_HK
dc.identifier.isiWOS:000083033500011-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLai, SW=7402937200en_HK
dc.identifier.scopusauthoridChan, MCW=7402598116en_HK
dc.identifier.scopusauthoridCheung, KK=7402406613en_HK
dc.identifier.scopusauthoridPeng, SM=35464852200en_HK
dc.identifier.scopusauthoridChe, CM=7102442791en_HK

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