Wankar Sneha, Limaye S N
Department of Chemistry, Dr. H. S. G.Vishwavidyalaya, Sagar, 470003, Madhya Pradesh, India,
J Fluoresc. 2015 Jul;25(4):787-94. doi: 10.1007/s10895-015-1573-6. Epub 2015 May 9.
Lanthanide complexes of p-nitrobenzoic acid(p-NBA) and o-phenanthroline(o-phen) namely [Ln2(Phen)2(p-NBA)3(NO3)2].2H2O where, Ln = Sm(III),Tb(III),Dy(III) and [Eu2(Phen)2(p-NBA)3].4H2O were synthesized and further characterized by Elemental analysis, UV spectroscopy, IR spectroscopy, (1)HNMR spectroscopy. Luminescence measurements were performed on all compounds in ethanolic solution. These complexes have showed narrow emission indicating that the organic ligands are better energy absorber and capable of transferring energy to the Ln (III) ion. Furthermore, we reported electronic spectral studies on [Eu2 (Phen)2 (p-NBA)3].4H2O in order to calculate following parameters, viz: Oscillator strength (f), Judd-Ofelt parameters Ωλ (λ = 2,4,6) and Radiative parameters. [Eu2 (o-Phen)2 (p-NBA)3].4H2O showed the strongest emission at 613 nm corresponds to (5)D0→(7)F2 hypersensitive transition, this emission is very sensitive to the environment. However, the larger value of Ω2 supports the presence of the hypersensitive transition (5)D0→(7)F2 which strictly depends on the nature of ligand. All electronic spectral parameters were calculated systemically.
对硝基苯甲酸（p-NBA）与邻菲罗啉（o-phen）的镧系配合物，即[Ln2(Phen)2(p-NBA)3(NO3)2].2H2O（其中Ln = Sm(III)、Tb(III)、Dy(III)）以及[Eu2(Phen)2(p-NBA)3].4H2O被合成出来，并通过元素分析、紫外光谱、红外光谱、（1）HNMR光谱进一步表征。在乙醇溶液中对所有化合物进行了发光测量。这些配合物显示出窄发射，表明有机配体是更好的能量吸收体，并且能够将能量转移到Ln(III)离子上。此外，我们报道了对[Eu2 (Phen)2 (p-NBA)3].4H2O的电子光谱研究，以便计算以下参数，即：振子强度（f）、贾德-奥费尔特参数Ωλ（λ = 2、4、6）和辐射参数。[Eu2 (o-Phen)2 (p-NBA)3].4H2O在613 nm处显示出最强发射，对应于(5)D0→(7)F2超灵敏跃迁，这种发射对环境非常敏感。然而，较大的Ω2值支持(5)D0→(7)F2超灵敏跃迁的存在，该跃迁严格取决于配体的性质。所有电子光谱参数都进行了系统计算。
