摘要
合成了对甲基苯甲酸铕与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)_3dipy(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)_3dipy在紫外光或可见光激发下,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.
The coordination compound of europium p-methylbenzoate with 2,2'-dipyridine was synthesized and characterized by elemental analysis and infrared spectrum. The crystal structure of the title compound, Eu2(p-MBA)6(dipy)2(p-MBA: p-methylbenzoate, dipy: 2,2'-dipyridine) was determined by the X ray diffraction analysis. It crystallizes in the monoclinic C2 / c system with unit cell dimensions a= 1.4086(6), b= 1.9115(11), c= 2.3077(16)nm; β= 96.60(4)°, V= 6.1727nm3 and Z=4. The metal atoms are octa-coordinated with the bidentates of p-methylbenzoate and 2,2'-dipyridine. Since the title coordination compound Eu(p-MBA)3 dipy fluoresces very intensely under ultraviolet or visible light. Using Eu(Ⅲ) ion as luminescent probe, the high-resolution 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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1995年第1期39-45,共7页
Acta Chimica Sinica
基金
国家攀登计划项目资助
