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, 1H, 13C NMR and IR spectral studies. The ligand is coordinated to the metals through its deprotonated pyrane-oxygen and the azo-group. 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 probable geometry around the central atoms is likely to be tetrahedral.
Key words: azo dye, metal complexes, 4-hydroxy-6- methyl-3-((Z)-4-methylphenylazo)-2H-pyran-2-one ligand
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