[Ni(BiquO_2)_3]^(2+)的立体构型和Ni^(2+)的吸收谱

The Steric Conformation and the Absorption Spectrum of Ni^(2+) Ion in the Complex Ni(BiquO_2)_3X_2

最近,Seminara等合成了一些以2,2’-二喹啉基-N,N’-二氧化物（BiquO2）为配体的金属配合物分子M（BiquO2）3X2。和已有的以2,2’-二吡啶基-N,N’-二氧化物（BipyO2）为配体的配位离子相比较,M（BiquO2）螯合环远大于M（BipyO2）螯合环,[M（BiquO2）3]的空间构型也更为复杂。本文通过对[Ni（BiquO2）3]2+配位离子中Ni2+吸收谱的理论分析,推导出Ni2+的晶场对称性,以此确定Ni（BiquO2）3X2分子的空间立体结构,解释这类配合物的电-磁性质和稳定性。已经测得配合物M（BiquO2）3X2[M=Co（Ⅱ）、Ni（Ⅱ）及Cu（Ⅱ）]的粉末和溶液（如丙酮、氯仿等为溶剂）的吸收谱。其特点是M（BiquO2）3X2的粉末状反射谱和溶液谱差异很小,且和X的种类（X=NO3,ClO4,CF3SO3）无关。由此说明。

From a theoretical analysis of the absorption spectral data of Ni^(2+) ion in Ni(BiquO_2)_3X_2, as measured by Seminara et al., it is proposed that in [Ni(BiquO_2)_3]^(2+) complex the three 2, 2'-biquinoly-N, N'-dioxide ligands occupy the trigonal distorted D_3 symmetry sites with the Ni^(2+) ion locates in the centre. The complete absorption spectrum of Ni^(2+) ions in [Ni(BiquO_2)_3]^(2+) complexes has been calculated. The effective magnetic moment of Ni^(2+) ion and CFSE have been determinated. A good agreement between the theoretical and observed values was observed.