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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
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
