Synthesis and Crystal Structure of Cobalt(III) Complexes of Salen Type Schiff Bases and Tertiary Phosphanes as Ligands

[Co(Salen)(PBu3)2]X (X = ClO4, BF4), [Co(Salpn)(PBu3)2]ClO4 and [Co(Salen)(PMe2Ph)2]ClO4) complexes (where salen = bis(salisylaldehyde) ethylenediimine) and salpn = bis(salisylaldehyde) 1,3-propanediimine)) were synthesiszed and chracterized by IR, UV-Vis, 1H NMR spectroscopy and elemental analysis. The IR and 1H NMR spectra cofirmed that the synthesised complexes contain Schiff base ligand, phosphane and the corresponding counter ion and the elemental analysis is in good agreement with the theoretical data calculated for the proposed formula. The coordination geometry of [Co(Salen)(PBu3)2]ClO4 and [Co(Salen)(PMe2Ph)2]ClO4 and complexes were determined by X-ray crystallography. It has been found that all the complexes are hexa coordinate in the solid state. Cobalt atom exhibits a distorted octahedral geometry and the salen ligand acts as N2O2 donor, occupying the the equatorial positions.