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Article: Crystal structure, spectroscopy and crystal field analysis of substituted 1,10-phenanthroline-europium complexes

TitleCrystal structure, spectroscopy and crystal field analysis of substituted 1,10-phenanthroline-europium complexes
Authors
KeywordsAbsorbance
Electronic structure
Europium
Luminescence
Issue Date2011
PublisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.eurjic.org
Citation
European Journal Of Inorganic Chemistry, 2011 n. 5, p. 637-646 How to Cite?
AbstractCrystal structures and vibrational and electronic spectroscopic data are reported for europium(III) complexes with 5(or 4)-R-1,10-phenanthroline (phen) ligands (R = chloro, methyl, nitro, amino). All complexes comprise a 10-coordinate Eu 3+ ion with three chelating nitrato anions and two bidentate phen ligands. The crystal structures are of three distinct types with space groups C2/c, P2 1/n and P1̄. The room-temperature emission spectra are dominated by the forced electric dipole 5D 0→ 7F 2 emission of Eu 3+. The excitation spectra show that the triplet donor state of the nitro-substituted complex has a lower energy than the other complexes and the lower luminescence quantum efficiency of this complex is rationalized. The emission spectra recorded at 10 K have been compared with those of the corresponding Eu 3+-doped yttrium complexes using different excitation lines as a criterion of sample purity. The spectrum of the unsubstituted phen complex is more clearly resolved than those of the other complexes and this has been attributed to disorder resulting in inhomogeneous broadening. A detailed crystal field analysis is given for the phen complex from the fitting of 24 crystal field energy levels. A comparison with other complexes has been made through derived second-rank crystal field strengths. No simple relationships have been derived from comparisons of energy levels, spectral line positions, or second-rank crystal field strengths with crystallographic data or Taft constants. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Persistent Identifierhttp://hdl.handle.net/10722/139007
ISSN
2014 Impact Factor: 2.942
2014 SCImago Journal Rankings: 0.935
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong University Grants Council ResearchU 102607
National Natural Science Foundation of China10804099
Funding Information:

P. A. T. acknowledges financial support for this project from the Hong Kong University Grants Council Research (Grant City, U 102607). This work was also supported by the National Natural Science Foundation of China (grant number 10804099). We are grateful to Prof. M. Hasegawa for sending reprints of his publications.

References

 

DC FieldValueLanguage
dc.contributor.authorPan, Zen_HK
dc.contributor.authorJia, Gen_HK
dc.contributor.authorDuan, CKen_HK
dc.contributor.authorWong, WYen_HK
dc.contributor.authorWong, WTen_HK
dc.contributor.authorTanner, PAen_HK
dc.date.accessioned2011-09-23T05:44:02Z-
dc.date.available2011-09-23T05:44:02Z-
dc.date.issued2011en_HK
dc.identifier.citationEuropean Journal Of Inorganic Chemistry, 2011 n. 5, p. 637-646en_HK
dc.identifier.issn1434-1948en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139007-
dc.description.abstractCrystal structures and vibrational and electronic spectroscopic data are reported for europium(III) complexes with 5(or 4)-R-1,10-phenanthroline (phen) ligands (R = chloro, methyl, nitro, amino). All complexes comprise a 10-coordinate Eu 3+ ion with three chelating nitrato anions and two bidentate phen ligands. The crystal structures are of three distinct types with space groups C2/c, P2 1/n and P1̄. The room-temperature emission spectra are dominated by the forced electric dipole 5D 0→ 7F 2 emission of Eu 3+. The excitation spectra show that the triplet donor state of the nitro-substituted complex has a lower energy than the other complexes and the lower luminescence quantum efficiency of this complex is rationalized. The emission spectra recorded at 10 K have been compared with those of the corresponding Eu 3+-doped yttrium complexes using different excitation lines as a criterion of sample purity. The spectrum of the unsubstituted phen complex is more clearly resolved than those of the other complexes and this has been attributed to disorder resulting in inhomogeneous broadening. A detailed crystal field analysis is given for the phen complex from the fitting of 24 crystal field energy levels. A comparison with other complexes has been made through derived second-rank crystal field strengths. No simple relationships have been derived from comparisons of energy levels, spectral line positions, or second-rank crystal field strengths with crystallographic data or Taft constants. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en_HK
dc.languageengen_US
dc.publisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.eurjic.orgen_HK
dc.relation.ispartofEuropean Journal of Inorganic Chemistryen_HK
dc.subjectAbsorbanceen_HK
dc.subjectElectronic structureen_HK
dc.subjectEuropiumen_HK
dc.subjectLuminescenceen_HK
dc.titleCrystal structure, spectroscopy and crystal field analysis of substituted 1,10-phenanthroline-europium complexesen_HK
dc.typeArticleen_HK
dc.identifier.emailWong, WT: wtwong@hku.hken_HK
dc.identifier.authorityWong, WT=rp00811en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/ejic.201000908en_HK
dc.identifier.scopuseid_2-s2.0-79751511245en_HK
dc.identifier.hkuros195818en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79751511245&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.issue5en_HK
dc.identifier.spage637en_HK
dc.identifier.epage646en_HK
dc.identifier.isiWOS:000287160800004-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridPan, Z=14623108400en_HK
dc.identifier.scopusauthoridJia, G=7103360294en_HK
dc.identifier.scopusauthoridDuan, CK=7202652556en_HK
dc.identifier.scopusauthoridWong, WY=7403972153en_HK
dc.identifier.scopusauthoridWong, WT=7403973084en_HK
dc.identifier.scopusauthoridTanner, PA=7101679850en_HK

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