کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5403287 | 1392756 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Luminescence and crystal-field fitting of two optical isomeric complexes of europium
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
FT-IR and Raman vibrational spectra and electronic emission spectra have been recorded for enantiomers of europium complexes with DBM: dibenzoylmethanate 1,2, and TTFA: 2-thenoyltrifluoroacetonate 3,4, employing the chiral ligands LSS(+)- and LRR(-)-4,5-pinene bipyridine. Contrary to the previously published X-ray data, where geometrical differences were stated to occur for particular enantiomers, the vibrational (and the emission) spectra of the individual optical isomers of a complex are not distinguishable. Using excitation into the Eu3+5D2 multiplet term, the emission intensity is weak from 5D1, whereas a complex structure is observed for the 5D0â7FJ transitions. Features in the vibronic sidebands exhibit similar derived vibrational energies to those observed in the Raman spectra. Fittings of 25 4f6 crystal-field energy levels of 2 and 4 have been attempted with some approximations concerning the local Eu3+ environments. The 5D0 emission lifetimes are monoexponential and are 0.5 (1,2) and 0.9Â ms (3,4) at room temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 129, Issue 5, May 2009, Pages 514-520
Journal: Journal of Luminescence - Volume 129, Issue 5, May 2009, Pages 514-520
نویسندگان
Guohua Jia, Chang-Kui Duan, Xi-Li Li, Peter A. Tanner,