Preparation and Characterisation of Some Mixed Ligand Complexes of Transition Elements. Part II. Complexes of Nickel(II) and Cobalt(II)

Department of Chemistry, Lucknow University, Lucknow-226 007, U. P. (India)

Manuscript received 28 February 1979, revised 9 July 1979, accepted 19 November 1979

A number of metal complexes of the type [Ni(phth) am₄ or dam₂] and [Co(phth) am₂ or dam₂] where, phth, am and dam stand for phthalate ion, an aromatic or heterocyclic amine and a diamine respectively, have been isolated by treating metal(II) phthalate with the required amount of the ligand in absolute ethanol. The formulae of complexes have been confirmed by the elemental analysis, conductivity and molecular weight studies. The magnetic and spectral measurements have also been done and these show that the nickel(ll) complexes are hexaco-ordinated with octahedral geometries, while the cobalt(II) complexes of aromatic or heterocyclic amines possess tetrahedral and those  of diamines, octahedral configurations. The assignment of absorption bands has been made and the value of Ligand field parameters are calculated.