铒甘氨酸配位化合物和铒组氨酸配位化合物的EXAFS谱研究  

The Extended X-ray Absorption Fine Structuve (EXAFS) Studies of the Complexes of Erbium (Ⅲ)—Glycine and Erbium (Ⅲ)—Histidine

作　　者：朱年永[1] 郑亦凡[1] 吴新涛[1] 陆坤权[2] 赵雅琴[2] 

机构地区：[1]中国科学院福州结构化学研究所 [2]中国科学院物理研究所

出　　处：《化学学报》1990年第3期247-250,共4页Acta Chimica Sinica

基　　金：中国科学院福州结构化学开放实验室科学基金

摘　　要：本文用EXAFS谱研究了三个固体铒甘氨基酸配位化合物,得到铒甘氨酸和铒组氨酸的第一配位层Er—O键长分别为2.35和2.32 A,配位数分别为8.3和8.O。并进一步用EXAFS径向结构函数图,讨论了与其结构类型的关系,推测出铒氨基酸配位化合物晶体的所属可能结构类型。Three solid complexes of erbium-amino acid were studied by the method of extended Ⅹ-ray absorption fine structure. Among the three solid complexes, the crystal sample of erbium serine Er_2·(Ser)_3·(ClO_4)_6·(Dio)_4·10H_2O (Ser=Serine, Dio=Dioxane), which has been determined by Ⅹ-ray singlecrystal structure analysis was used as the standard sample to extract the struetural coefficients.The Er—O bond length and coordination number of the first coordination sphere of the crystal erbium-serine are 2.34 A and 8.0, respectively.After curve fitting, the Er—O bond length and coordination number of two other complexes, erbium-glycine and erbium-histidine,are shown to be 2.35 A, 8.3; and 2.32 A, 8.0, respectively.Furthermore, the relationship between the structural types of the complexes and the radial-structure-function (RSF) from EXAFS are discussed.Comparing the second peaks of the radial-structure-function of the EXAFS, the possible structural types of the erbium-amino-acid complexes were proposed.

关 键 词：铒配合物 甘氨酸 组氨酸 EXAFS谱 

分 类 号：O614.344[理学—无机化学]