铕(Ⅲ)-呋喃甲酸配合物的光谱表征

Spectra of Complexes Eu(Ⅲ)-furoic Acid

以硝酸铕 ,呋喃甲酸和邻菲咯啉 (phen)合成了配合物 [Eu(FA) 3·2H2 O]·NO3(4 ,4’ Hbpy) ,[Eu(FA) 3·phen]H2 O和Eu(FA) 2 ·NO3·phen。用元素分析、红外吸收光谱、紫外吸收光谱和溶液荧光光谱对配合物进行了组成确定和表征。溶液荧光光谱表明 ,配合物 [Eu(FA) 3·2H2 O]·NO3(4 ,4’ Hbpy)的发光强度比混配配合物Eu(FA) 2 ·NO3·phen和 [Eu(FA) 3·phen]H2 O的发光强度小很多 ,而且发光寿命较短 ,三元配合物 [Eu(FA) 3·phen]H2 O的发光强度比四元配合物Eu(FA) 2

Three europium complexes [Eu(FA) 3·2H 2O]·NO 3(4,4'-Hbpy), [Eu(FA) 3·phen]H 2O and Eu(FA) 2·NO 3·phen have been synthesized (FA=α-furoate, phen=1,10-phenanthroline, 4,4'-Hbpy=4,4'-bipyridine). The compositions and structures of these complexes were determined with elemental analysis, IR, UV and luminescence spectra. The luminescence spectra of the Eu complexes in solution show that the intensity of the ternary complex [Eu(FA) 3·phen]H 2O is higher than that of the quaternary complex Eu(FA) 2·NO 3·phen, and much higher than that of [Eu(FA) 3·2H 2O]·NO 3(4,4'-Hbpy). The measured lifetime is 0.46 ms for complex [Eu(FA) 3·2H 2O]·NO 3(4,4'-Hbpy). These measured lifetimes are 1.13 and 1.20 ms for complexes [Eu(FA) 3·phen]H 2O and Eu(FA) 2·NO 3·phen, respectively. This phenomenon correlates with antenna effect of phen and luminescence quenching of coordinated water.