Synthesis, characterization and cis–trans influence in cobaloximes with nioxime

A synthetic scheme leading to the (X)(Y)bis(1,2-cyclohexanedionedioximato)cobalt(III) complexes, where X=Cl, N3, ClCH2, CH3, C2H5 and Y=PPh3 and Py is reported. The complexes have been characterized by the usual spectroscopic techniques and have been compared with the reported analogous compounds having other dioximes as the equatorial ligands. The first crystal structure of an inorganic cobaloxime with 1,2-cyclohexanedionedioxime (Nioxime) is reported. For a range of X ligands, a clear trend between 31P, 13C, 1H chemical shifts of the equatorial and axial ligands as well as with the Co→chgH charge transfer band has been observed.