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标题配合物分子量M_1=1475.19,P1空间群,α=1.3349(7)nm,b=1.9790(4)nm,c=1.2784(7)nm,α=97.67(1),β=106.36(1),γ=91.71(1)°,Z=2,T=295K。最终的偏离因子R=0.051。晶体每个不对称单位中有两个晶体学上不等同的Eu(p-CH_3C_6-H_4COO)_3(C_(12)H_8N_2)结构单元,每种结构单元通过反演操作与邻近不对称单位中一个相应的结构单元结合,形成两种双核分子。前者有4个苯甲酸的羧基桥联两个中心Eu(Ⅲ)离子,后者只有两个羧基参与桥联。两者的Eu—Eu原子间距分别为0.4203和0.5298nm。在配合物的~7F_0→~5D_0激发光谱里,580.07和580.73nm处呈现两个锐峰,可以认为配合物具有两种Eu(Ⅲ)格位。选择激发配合物的~5D_0能级,得到两组完全不同的~5D_0→~7F_J(J=1—4)发光光谱,表明配合物中Eu(Ⅲ)离子有不同的化学环境。与晶体结构分析结果一致。
The title complex has a molecular weight of M_1 = 1475.19, space group P1, α = 1.3349 (7) nm, b = 1.9790 (4) nm, c = 1.2784 γ = 91.71 (1) °, Z = 2, T = 295K. The final deviation factor R = 0.051. There are two crystallographically Eu (p-CH_3C_6-H_4COO) _3 (C_ (12) H_8N_2) structural units in each asymmetric unit of the crystal. Each structural unit is obtained by inversion operation with one of the neighboring asymmetric units The corresponding building blocks are combined to form two binuclear molecules. The former has four benzoic acid carboxyl bridged two center Eu (Ⅲ) ions, the latter only two carboxyl groups involved in bridging. Eu-Eu atomic spacing between the two were 0.4203 and 0.5298nm. In the excitation spectrum of ~ 7F_0 → ~ 5D_0, there are two sharp peaks at 580.07 and 580.73 nm. It can be considered that the complex has two Eu (Ⅲ) sites. The ~ 5D_0 energy levels of the excited complexes were chosen to give two completely different luminescence spectra of ~ 5D_0 → ~ 7F_J (J = 1-4), indicating that Eu (Ⅲ) ions have different chemical environments in the complex. Consistent with the results of the crystal structure analysis.