硝酸铕与含氮冠醚配合物的电子结构和化学键  

Electronic Structure and Chemical Bonding of Europium Nitrate Complex with Azacrown (2, 2)

作　　者：李振祥[1] 刘世昌[2] 倪嘉缵[1] 任镜清[3] 黎乐民[3] 

机构地区：[1]中国科学院长春应用化学研究所稀土化学与物理开放实验室 [2]内蒙古师范大学化学系 [3]北京大学化学系

出　　处：《化学学报》1990年第10期1006-1010,共5页Acta Chimica Sinica

基　　金：国家自然科学基金

摘　　要：本文用XPS和INDO方法研究了硝酸铕与含氮冠醚配合物[Eu(NO_3)_2(2,2)]NO_3的电子结构。结合能和电荷分布数据指出,在配位原子中,电负性低的氮原子Nls结合能的化学位移比电负性高的氧原子Ols的大。在配合物中,氮原子转移至中心金属离子上的电荷比氧原子转移的多。铕与含氮冠醚配合物的化学键具有一定程度的共价性,电负性低的氮原子与铕的配位键(N→Eu)的共价性比电负性高的氧原子的配位键(O→Eu)的大。The electronic structure and bond character of europium nitrate complex with azacrown (2, 2)(1, 7, 10, 16-tetraoxa-4, 13-diazacyclooctadecane), [Eu(NO_3)_2(2, 2)] NO_3, have been studied by means of XPS and INDO method. The data of electronic binding energies and charge distribution of atoms in the complex showed that chemical shift of less electronegative nitrogen N1s binding energy was larger than that of more electronegative oxygen O1s binding energy in coordinating atoms, and that charge transfer from N to Eu occurred to a greater extent than that from O to Eu in the complex. It indicated that dative bonds of europium complex with azacrown possessed certain covalence in character, and that covalency of dative bond N→Eu was larger than that of bond O→Eu in the complex.

关 键 词：铕配合物 含氮冠醚 电子结构 

分 类 号：O614.338[理学—无机化学]