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一、引言自然界中存在大量的具有3d~3■电子组态的过渡金属离子V(Ⅱ)、Cr(Ⅲ)和Co(Ⅱ)所构成的络合物,在这些络合物中,不少晶体具有低对称度D_(3d)的立体结构,研究其中某一典型例子,对于该大类的络合物的晶场光谱和磁学性质的讨论具有一定的代表作用.VCl_2属晶体类AX_2(A=M(Ⅱ);X=Cl,Br,Ⅰ)的卤族元素络合物。对于晶体类AX_2,中心金属离子和卤素配体X-之间存在强的共价键效应,利用中心金属自由离子A(Ⅱ)的d
I. INTRODUCTION There are a large number of complexes of transition metal ions V (Ⅱ), Cr (Ⅲ) and Co (Ⅱ) with 3d ~ 3 ■ electron configurations in nature. Among these complexes, many The crystal has a low degree of symmetry D_ (3d) of the three-dimensional structure, to study a typical example of the large class of complex crystal field spectroscopy and magnetic properties have a certain representative role.VCl_2 belong to the crystal class AX_2 ( A = M (II); X = Cl, Br, I). For the crystal class AX_2, there is a strong covalent bond between the central metal ion and the halogen ligand X-, using the d