配体Cl^-、NO_2^-和NH_3对晶体场强度的影响

THE EFFECT OF LIGANDS OF Cl^-, NO_2^- AND NH_3 ON CRYSTAL FIELD STRENGTH

用紫外分光光度计测得合成三价钴的配合物［Co（NH3）5Cl］Cl2和［Co（NH3）5NO2］Cl2水溶液吸收曲线并与配合物［Co（NH3）6］Cl3吸收曲线相比较，得出三个配合物不同的最高吸收峰位置，从而判断出配体Cl－、NO和NH3对Co3＋离子所形成的晶体场强度顺序为NO＞NH3＞Cl－。

The cobaltic compounds of (Co(NH3)5Cl)Cl2and (Co(NH3)5NO2)Cl2 were synthesized.And their UV spectra were measured by using a 72G Spectrophotometer in the solution. For compounds (Co(NH3)5Cl)Cl2, (Co(NH3)5NO2)Cl2 and (CO(NH3)6)Cl3, their UV spectra appear separately. So it can be determined that the strength of ligands is NO2＞NH3＞Cl-.