Synthesis and Physicochemical Properties of Some β‐Ketoaminato Cobalt(II) Chelates and Their Adducts with 2,2′‐Bipyridine and 1,10‐Phenanthroline

Abstract The cobalt(II) β‐ketoamines complexes {Co[CH3C(O)CHC(CH3)NR]2; R = CH3, CH2(OH)CH2, C4H9} and ketoiminates {Co[CH3C(O)CH(CH3)C(‐N(CH2) n N‐)C(CH3)CHC(O)CH3]} and their adducts with 2,2′‐bipyridine (bipy) and 1,10‐phenanthroline (phen) have been synthesized and characterized by elemental analyses, magnetic susceptibility, conductivity, infrared, and electronic spectral measurements. The ligands coordinate to the cobalt ion in a bidentate manner using the N2O2 chromophore. The effective magnetic moments (μeff) observed for the complexes are in the range of 4.20–5.30 BM. Electronic spectra results and magnetic susceptibility measurements are consistent with the adoption of a four‐coordinate geometry for the cobalt(II) chelates and a six‐coordinate octahedral geometry for the 2,2′‐bipyridine and 1,10‐phenanthroline adducts. The available conductance data in nitromethane indicates that the compounds are non‐electrolytes.