Article: Crystal structure, spectroscopy and crystal field analysis of substituted 1,10-phenanthroline-europium complexes
| Title | Crystal structure, spectroscopy and crystal field analysis of substituted 1,10-phenanthroline-europium complexes | ||||||
|---|---|---|---|---|---|---|---|
| Authors | Pan, Z2 4 Jia, G2 Duan, CK2 Wong, WY3 Wong, WT1 Tanner, PA2 | ||||||
| Keywords | Absorbance Electronic structure Europium Luminescence | ||||||
| Issue Date | 2011 | ||||||
| Publisher | Wiley - 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?] DOI: http://dx.doi.org/10.1002/ejic.201000908 | ||||||
| Abstract | Crystal 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. | ||||||
| ISSN | 1434-1948 2011 Impact Factor: 3.049 2011 SCImago Journal Rankings: 0.183 | ||||||
| DOI | http://dx.doi.org/10.1002/ejic.201000908 | ||||||
| ISI Accession Number ID | WOS:000287160800004
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 | References in Scopus |
| dc.contributor.author | Pan, Z | ||||||
|---|---|---|---|---|---|---|---|
| dc.contributor.author | Jia, G | ||||||
| dc.contributor.author | Duan, CK | ||||||
| dc.contributor.author | Wong, WY | ||||||
| dc.contributor.author | Wong, WT | ||||||
| dc.contributor.author | Tanner, PA | ||||||
| dc.date.accessioned | 2011-09-23T05:44:02Z | ||||||
| dc.date.available | 2011-09-23T05:44:02Z | ||||||
| dc.date.issued | 2011 | ||||||
| dc.description.abstract | Crystal 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. | ||||||
| dc.description.nature | Link_to_subscribed_fulltext | ||||||
| dc.identifier.citation | European Journal Of Inorganic Chemistry, 2011 n. 5, p. 637-646 [How to Cite?] DOI: http://dx.doi.org/10.1002/ejic.201000908 | ||||||
| dc.identifier.doi | http://dx.doi.org/10.1002/ejic.201000908 | ||||||
| dc.identifier.epage | 646 | ||||||
| dc.identifier.hkuros | 195818 | ||||||
| dc.identifier.isi | WOS:000287160800004
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. | ||||||
| dc.identifier.issn | 1434-1948 2011 Impact Factor: 3.049 2011 SCImago Journal Rankings: 0.183 | ||||||
| dc.identifier.issue | 5 | ||||||
| dc.identifier.scopus | eid_2-s2.0-79751511245 | ||||||
| dc.identifier.spage | 637 | ||||||
| dc.identifier.uri | http://hdl.handle.net/10722/139007 | ||||||
| dc.language | eng | ||||||
| dc.publisher | Wiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.eurjic.org | ||||||
| dc.publisher.place | Germany | ||||||
| dc.relation.ispartof | European Journal of Inorganic Chemistry | ||||||
| dc.relation.references | References in Scopus | ||||||
| dc.subject | Absorbance | ||||||
| dc.subject | Electronic structure | ||||||
| dc.subject | Europium | ||||||
| dc.subject | Luminescence | ||||||
| dc.title | Crystal structure, spectroscopy and crystal field analysis of substituted 1,10-phenanthroline-europium complexes | ||||||
| dc.type | Article |
Author Affiliations
- The University of Hong Kong
- City University of Hong Kong
- Hong Kong Baptist University
- Zhejiang University of Technology