The Raman spectra of cobalt(III) complexes. V. Differentiation between two cis(a) isomers of (Coa2(NH3)2(en)) type complexes (a=NO2- and CN-).

Three geometrical isomers of [Co(NO2)2(NH3)2(en)]+ were newly prepared. Two cis(NO2) isomers (trans(NH3) and cis,cis) were clearly differentiated on the basis of the polarizabilities of the Raman bands due to Co–N(NH3 and en) stretching vibrations. The Raman polarization measurement was also applied successfully to the determination of the geometrical configurations of two [Co(CN)2(NH3)2(en)]+ isomers. The structural assignments were substantiated by optical resolution of the cis,cis isomers of [Coa2(NH3)2(en)]+ (a=NO2− and CN−).

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