SYNTHESIS OF METHYL, BENZYL AND PSEUDO-HALOGENO CO (III) COMPLEXES OF A DIOXIME CONTAINING A CROWN ETHER MOIETY

Sangeeta Sahu

Abstract: In view of the importance of the macrocyclic chemistry, the Cobalt (II) complexes of several new categories of azamacrocycles were synthesized. Here we describes a new quadridentate ligand 5,6-Benzo(15-crown-5)4,7-diaza deca-2,9-ethanedial dioxime (C18H24N4O7).This chelate coordinates with cobalt in the equatorial position as a monoanion leaving the axial sites vacant for coordination by a variety of monodentate ligands, thereby paving the way for the synthesis of pseudo halogeno and alkyl Co(III) complexes. The macrocyclic ligands and their complexes have been characterized by elemental analysis, molecular weight determination, conductance, IR and NMR spectral studies. The spectral data suggested tetra coordinated state for cobalt, its geometry is tetrahedral. Conductivity data suggests that they behave as electrolytes. The formulation of the complexes has been established on the basis of chemical composition. Further analysis for C, H, and N and may be required for complete description of the complexes. The ligand and their complexes have been used as catalyst in many industries

Keywords: Cobalt, Macrocyclic complex, synthesis, spectroscopy

DOI: https://doi.org/10.15623/ijret.2013.0202001