【摘要】 <正> 稀土有机化合物的研究是当前十分活跃的一个领域.有关氯化稀土吡啶配合物的合成早已有报道,但系统地分离出具有LnCl₃·nPy配合物的工作是最近才完成的.迄今尚未见到关于这类配合物晶体结构的报道.我们首先用X射线单晶衍射的方法,测定了EuCL₃·4Py的晶体结构,揭示了这类配合物的结构特征.更多还原

【Abstract】 The crystal of europium trichloride tetrapyridine （EuC1₃·4Py） belongs to the monoclinic system. The space group is P2₁/n, with α=15.925（4）, b=17.225（5）, c=9.780（7）A, β=103.28（2）°, Z=4. The intensity dataof 5045 independent reflections were collected using a PW-1100 four-circle diffractometer. The structure was solved by the heavy-atom method. The structure parameters were refined by block-diagonal least-squares method, final discrepancy R=0.073. A slightly distorted pentagonal bipyramid polyhedron is formed by three chlorine and four nitrogen atoms surrounding the europium atom. The average bond lengths: Eu-Cl=2.654A and Eu-N=2.600A.更多还原