Abstract
The structures of trans-(NH 2Ph)(Me)Co(DH) 2 ( 1), trans-(NH 2Ph)(CH 2C(CO 2Et) 2Me)Co(DH) 2 ( 2), and trans-(PPh( cHex) 2)(CH 2C(CO 2Et) 2Me)Co(DH) 2 ( 3), where DH = monoanion of dimethylglyoxime have been determined by X-ray diffraction studies. The variations in the geometry of these octahedral cobalt(III) complexes are interpreted in terms of steric and electronic influences. Linear regression analyses of CoC bond lengths with α and d (measures of the geometrical deformation of the equatorial moiety) in methyl cobaloximes have confirmed that steric effects play a significant role in the CoC bond stability of vitamin B 12 models.
Published Version
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