Mixed cobalt(III) complexes with S-tyrosine and 1,3-diaminopropane

Four out of six theoretically possible isomers of the (1,3-diaminopropane)b is(S-tyrosinato)cobalt(III) complex, having the cis(O) configuration, were isolated, and the trans(O) isomer was only defined in the eluate. The isome rs were separated on an optically active Sephadex QAE column. Geometrical a nd absolute configurations of the isomers were determined by electronic abs orption, circular dichroic and H-1 NMR spectra. The effect of the aromatic side group of the coordinated S-tyrosinato ligand on the stereoselective fo rmation of the obtained isomers was examined.