Synthesis and spectral characterization of some investigated thiocarbohydrazone binuclear complexes with an illustrated EPR study for d1 complexes

Some new complexes were synthesized using pyrol-2-carbaldhyde thiocarbohydrazone ligand and characterized using physicochemical techniques. The i.r. data reveal that, the ligand acts as a mononegative tetradentate in Ni-I and Cu(II)binuclear complexes. Also, they coordinate as mononegative tridentates with Co-II, Cd(II)sand VO2+ ions but in the neutral state with Pt-IV ion in a mononuclear monomer structure for Co(II)stop and Cd-IIs complexes, but binuclear dimer structure through bridged sulphate for the VO2+ complex. The magnetic moment beside the electronic spectral data proposed the complex geometries as a mixed stereochemistry for Ni-II, square-planar for Cu-II square-pyramidal for VOand octahedral for the other complexes. The thermal analysis supports the proposal of the presence or absence of water molecule in or outside the coordination sphere. The EPR spectra of Cu<(I)and VO(2+)somplexes were illustrated elaborately and some theoretical data were abstracted from EPR curves to support the proposed structures.