Relative Study of Luminescent Properties with Judd-Ofelt Characterization in Trivalent Europium Complexes Comprising ethyl-(4-fluorobenzoyl) Acetate

被引：24

作者：

Devi, Rekha ^{[1
]}

Chahar, Sangeeta ^{[1
]}

Khatkar, S. P. ^{[1
]}

Taxak, V. B. ^{[1
]}

Boora, Priti ^{[1
]}

机构：

[1] Maharshi Dayanand Univ, Dept Chem, Rohtak 124001, Haryana, India

来源：

JOURNAL OF FLUORESCENCE | 2017年 / 27卷 / 04期

关键词：

Luminescence; Infrared spectroscopy; Quantum efficiency; Judd-Ofelt intensity parameters; Energy transfer; INTRAMOLECULAR ENERGY-TRANSFER; SENSITIZED LUMINESCENCE; LANTHANIDE COMPLEXES; SCHIFF-BASE; EU(III); LIGAND; EMISSION; TB(III); THENOYLTRIFLUOROACETONATE; COORDINATION;

D O I：

10.1007/s10895-017-2069-3

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

Five new europium(III) complexes Eu(p-EFBA)(3).(H2O)(2) (C1), Eu(p-EFBA)(3).neo (C2), Eu(p-EFBA)(3).batho (C3), Eu(p-EFBA)(3).phen (C4), Eu(p-EFBA)(3).bipy (C5) have been synthesized by using ethyl-(4-fluorobenzoyl) acetate (p-EFBA) as beta-ketoester ligand and neocuproine (neo), bathophenanthroline (batho), 1,10-phenanthroline (phen) and 2,2-bipyridyl (bipy) as ancillary ligands. The synthesized complexes C1-C5 were characterized by elemental analysis, nuclear magnetic resonance spectroscopy (H-1-NMR), infrared (IR) spectroscopy, thermogravimetric analysis (TG/DTG), UV-visible and photoluminescence (PL) spectroscopy. The relative study of luminescence spectra of complexes with the previously reported complexes of isomeric ligand (ortho and meta substituted ligand) indicate the higher luminescence properties of complexes as an effect of fluorine position on beta-ketoester ligand. The para substituted ligand shows a remarkable effect on quantum efficiencies and Judd-Ofelt intensity parameters (Omega(2,) Omega(4)) of the complexes. The higher value of intensity parameter Omega(2) associated with hypersensitive D-5(0) -> F-7(2) transition of europium(III) ion revealing highly polarizable ligand field. The purposed energy transfer mechanism of complexes indicates the efficient energy transfer in complexes.

引用

页码：1349 / 1358

页数：10

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