铕(Ⅲ)与对甲基苯甲酸.2,2'-联吡啶配合物的合成.晶体结构及荧光光谱

合成了对甲基苯甲酸铕2,2'-联吡啶的晶体配合物,元素分析表明配合物的化学式为Eu(p-MBA)~3 dipy(p-MBA:对甲基苯甲酸根;dipy:2,2'-联吡啶).用X 射线衍射法测定了配合物的单晶结构,其结构式为Eu~2(p-MBA)~6(dipy) ~ 2, 属单斜晶系,C2/C空间群,晶胞参数:a=1.4086(6),b=1.9115(11),c=2.3077(16)nm;β=96.60(4)~°,V=6.1727nm^3,Z=4对甲基苯甲酸根,2,2'-联吡啶均以双齿配位, 中心铕离子的配位数为八,形成的配位多面体为三角十二面体,两个铕离子通过四个对甲基苯甲酸基桥联,形成双核配合物,利用配合物Eu(p-MBA)~3 dipy在紫外光或可见激发下, 能发出很强荧光的特性,以Eu(Ⅲ)离子为光谱探针,77K 下测得其高分辨激发和发射光谱及时间分辨光谱,光谱数据表明配合物中有两种Eu(Ⅲ)离子格位.

Synthesis crystal structure and luminescence of coordination compound of europium p-methylbenzoate with 2,2'-dipyridine

Eu2(p-MBA)6(bpy)2 (I; p-MBA = p-methylbenzoate) was synthesized and characterized by elemental anal. and IR spectrum. The crystal structure of I was determine by the x-ray diffraction anal. It crystallizes in the monoclinic space group C2/c with a 1.4086(6), b 1.9115(11), c 2.3077(16) nm: b 96.60(4)?and Z = 4. The metal atoms are octacoordinated with the bidentate ligands. Since I fluoresces very intensely under UV or visible light, using Eu(III) ion as luminescent probe, the high-resoln. laser excited excitation and luminescence spectra and time resolved spectra were recorded at 77K. The emission spectra indicate that two Eu(III) ion sites are present in the compound