Stereoselective formation of cobalt(II), nickel(II) and zinc(II) chelates of histidine☆

Add time:10/01/2019    Source:sciencedirect.com

Formation of the 2: 1 histidine complexes of cobalt(II), nickel(II), and zinc(II) is stereoselective, the mixed D, L-complexes being preferred over the unmixed L, L-complexes, in aqueous solutions. Analysis of titration data indicates that the racemic cobalt(II), nickel(II) and zinc(II) complexes are favored by 12, 22, and 13 per cent respectively, over what is expected statistically. The stereoselectivity observed for the zinc(II) complexes suggests that they possess octahedral characteristics in aqueous solution. No stereoselectivity is observed in the cadmium(II) and copper (II) bis complexes of histidine, nor in the nickel(II) and copper(II) bis complexes of 2,3-diaminopropionic acid. Stereoselectivity appears to be dependent upon the presence of a bulky side chain in a tridentate ligand chelated to a small metal ion.

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