Synthesis and Spectroscopic Study of Bivalent Metal Complexes with 4-hydroxy-6- methyl-3-((Z)-4-methylphenylazo)-2H-pyran-2-one ligand

Abstract

Six chelate complexes of 4-hydroxy-6-methyl-3-((Z)-4-methylphenylazo)-2H-pyran-2-one (HL) ligand with Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) were synthesized and characterized by elemental analysis, magnetic susceptibility measurements, electronic, 1 H, 13 C NMR and IR spectral studies. The ligand is coordinated through its deprotonated pyrane-oxygen and through the azo-group to the metals. Mn(II), Co(II), Cu(II) and Ni(II) complexes have octahedral geometry around the central atoms. The molar conductance measurements on chloride-ion containing Zn(II) and Cd(II) complexes confirmed that chloride ions are bound in the coordination sphere, and the most probably geometry around the central atoms is expected to be tetrahedral.