A novel optically active tetraamine ligand possessing four asymmetric centers, N,N′-bis(2(S)-aminopropyl-1(R),2(R)-trans-1,2-diaminocyclohexane (SRRS-apchxn) and its cobalt(III) complexes, [Co(SRRS-apchxn)X2]n+ (X=Cl-, H2O, X2 = CO32-) have been synthesized. This ligand has coordinated stereospecifically to the cobalt(III) ion to give only the Λ-uns-cis-(SS) isomer. A trans dichloro complex has been obtained via the stereospecific isomerization of Λ-uns-cis-(SS)-[Co(SRRS-apchxn)Cl2]+ to trans-(SS)-[Co(SRRS-apchxn)Cl2]+ in CH3OH-HCl medium. Ligand and complexes have been characterized by electronic absorption, 1H NMR, CD spectra, and also by elemental analysis. It is of interest that this is one of the few CoIII(N4)X2 type complex preparations, which produces such an uns-cis isomer with stereospecificity.
|Number of pages||5|
|Journal||Bulletin of the Korean Chemical Society|
|Publication status||Published - 1996|
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