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由2-甲硫基烟酸(HA)与Eu(Ⅲ)合成了二元配合物和13种分别掺杂La(Ⅲ),Y(Ⅲ),Zn(Ⅱ)的三元配合物。通过红外、紫外、元素分析、荧光光谱和热重分析对配合物进行了表征。并着重研究了掺杂离子、溶剂、配合物溶液的浓度对配合物中Eu(Ⅲ)发光性能的影响。紫外光谱显示HA与铕离子配位后其吸收峰强度发生较大改变。红外光谱表明2-甲硫基烟酸中的羧基与铕离子以螯合双齿配位,且单一配合物和掺杂配合物具有相似的配位结构。荧光光谱表明La(Ⅲ),Y(Ⅲ),Zn(Ⅱ)掺杂可以提高铕配合物的荧光强度,其中La(Ⅲ)掺杂荧光强度增强最明显。配合物(Eu0.5Zn0.5)(A)2.5·3H2O以乙醇为溶剂,浓度为5×10-5mol·L-1时,其荧光强度是最强的。
Binary complexes and 13 ternary complexes doped with La (Ⅲ), Y (Ⅲ) and Zn (Ⅱ) were synthesized from 2-methylthio nicotinic acid (HA) and Eu (Ⅲ). The complexes were characterized by IR, UV, elemental analysis, fluorescence spectroscopy and thermogravimetric analysis. The effects of concentration of doping ions, solvent and complex solution on the luminescent properties of Eu (Ⅲ) in the complex were also studied. UV spectroscopy showed that the intensity of absorption peak of HA changed greatly after coordination with europium ion. Infrared spectra showed that the carboxyl group in 2-methylthio nicotinic acid coordinated with europium ion in chelate bidentate, and the single complex and doping complex had similar coordination structure. Fluorescence spectra show that La (Ⅲ), Y (Ⅲ) and Zn (Ⅱ) doping can increase the fluorescence intensity of Eu (Ⅲ) complexes, and the fluorescence intensity of La (Ⅲ) doping is the most obvious. The fluorescence intensity of the complex (Eu0.5Zn0.5) (A) 2.5 · 3H2O with ethanol as the solvent and the concentration of 5 × 10-5 mol·L-1 was the strongest.