Sengar Manju, Narula Anudeep Kumar
University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, Sec-16 C, Dwarka, Delhi, 110078, India.
J Fluoresc. 2019 Jan;29(1):111-120. doi: 10.1007/s10895-018-2315-3. Epub 2018 Oct 27.
Five luminescent Eu(III)-4-fluoro-N-salicylideneaniline (Fsa) complexes with different N,N'- donor heterocyclic ligands (L) were synthesized (where L = 2,2'-bipyridine (bipy), 4,4'-dimethoxy-2,2'-bipyridine (dmbp), 1,10-phenanthroline (phen), 2,9-dimethyl-1,10-phenanthroline (neo) and 2,2'-biquinoline (biq)) and characterized by structural, thermal and spectroscopic analyses. The photophysical studies of the complexes viz. UV-Vis absorption spectra, emission spectra, lifetime decay curve, radiative, non-radiative transition rates and quantum yields were investigated. The photophysical properties indicated that fluorine substituted salicylideneaniline acts as a better sensitizer for Eu ion after involvement of ancillary ligands which leads to efficient energy transfer resulted in bright red emission due to D → F transition. The highest overall quantum yield (32.78%) and sensitization efficiency (75.30%) of [Eu(Fsa)neo] showed that it is a potential candidate in optical field. Graphical Abstract Sensitization of europium(III)-Schiff base complexes by antenna effect.
合成了五种与不同N，N'-给体杂环配体（L）配位的发光铕（III）-4-氟-N-水杨醛苯胺（Fsa）配合物（其中L = 2,2'-联吡啶（bipy）、4,4'-二甲氧基-2,2'-联吡啶（dmbp）、1,10-菲咯啉（phen）、2,9-二甲基-1,10-菲咯啉（neo）和2,2'-联喹啉（biq）），并通过结构、热和光谱分析对其进行了表征。对这些配合物进行了光物理研究，即紫外-可见吸收光谱、发射光谱、寿命衰减曲线、辐射和非辐射跃迁速率以及量子产率。光物理性质表明，在辅助配体参与后，氟取代的水杨醛苯胺对铕离子起到了更好的敏化剂作用，这导致了有效的能量转移，由于D→F跃迁产生了明亮的红色发射。[Eu(Fsa)neo]的最高总量子产率（32.78%）和敏化效率（75.30%）表明它是光学领域的一个潜在候选物。图形摘要：通过天线效应敏化铕（III）-席夫碱配合物。
