کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5398995 | 1392672 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Intriguing light-emission features of ketoprofen-based Eu(III) adduct due to a strong electron-phonon coupling
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Lanthanide-based coordination compounds of molecular formula [Ln(keto)3(H2O)], where Ln=Gd, Eu and keto=ketoprofen, were synthesized and their photoluminescence features were detailed in the 12-300Â K interval. The emission spectra of [Eu(keto)3(H2O)] reveal a strong dependence with the temperature, well-illustrated by an unusual large blue-shift (â¼17Â cmâ1) of the 5D0â7F0 transition as the temperature is raised. The arithmetic difference between the absorption spectrum of [Eu(keto)3(H2O)] with that of [Gd(keto)3(H2O)] pointed out the presence of a ligand-to-metal charge transfer (LMCT) band (320-370Â nm). From the [Gd(keto)3(H2O)] phosphorescence the energy of the keto-related triplet states was determined showing a large overlap with the intra-4f6 levels and a strong electron-phonon coupling. The high-resonance between the LMCT and triplet states and the Eu3+ levels leads to a strong dependence of the 5D0 lifetime value, typical of the presence of operative energy transfer processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 170, Part 2, February 2016, Pages 357-363
Journal: Journal of Luminescence - Volume 170, Part 2, February 2016, Pages 357-363
نویسندگان
M.G. Lahoud, R.C.G. Frem, D.A. Gálico, G. Bannach, M.M. Nolasco, R.A.S. Ferreira, L.D. Carlos,