Synthesis and PMR Study of Mixed Ligand Cobalt(III) Complexes with Aliphatic α-Hydroxyimino Ketone and Pyridine

Abstract

Abstract Cobalt(III) complexes with a series of aliphatic α-hydroxyimino ketone (moH) and pyridine (py) were obtained as fine crystals. The aliphatic α-hydroxyimino ketones used are R–C(=O)–C(=NOH)–R′ where R=CH3 or C2H5 and R′=CH3, C2H5, i-C3H7, n-C3H7 or COCH3. These complexes are formulated as [Co(mo)2(py)2]ClO4. The PMR spectral investigation shows that the proton resonances of the alkyl group bound to the hydroxyimino group are shifted toward higher fields upon complex formation. This unusual upfield shift is accounted for by consideration of the specific configuration and ring-current of the pyridine in the complex.