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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zaifa Pan
  • Guohua Jia
  • Chang-Kui Duan
  • Wai-Yeung Wong
  • Wing-Tak Wong
  • And 1 others
  • Peter A. Tanner

Detail(s)

Original languageEnglish
Pages (from-to)637-646
Journal / PublicationEuropean Journal of Inorganic Chemistry
Volume2011
Issue number5
Online published10 Jan 2011
Publication statusPublished - Feb 2011

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 Eu3+ ion with three chelating nitrato anions and two bidentate phen ligands. The crystal structures are of three distinct types with space groups C2/c, P21/n and P1̄. The room-temperature emission spectra are dominated by the forced electric dipole 5D07F2 emission of Eu3+. 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 Eu3+-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.

Research Area(s)

  • Absorbance, Electronic structure, Europium, Luminescence

Citation Format(s)

Crystal structure, spectroscopy and crystal field analysis of substituted 1,10-phenanthroline-europium complexes. / Pan, Zaifa; Jia, Guohua; Duan, Chang-Kui; Wong, Wai-Yeung; Wong, Wing-Tak; Tanner, Peter A.

In: European Journal of Inorganic Chemistry, Vol. 2011, No. 5, 02.2011, p. 637-646.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review