Synthesis and Structural Studies of Transition Metals Complexes with Poly dentate Azo dye ligand Derived from Coumarine

Document Type : Original Article


1 Ministry of Education, Directorate of Education, Anbar

2 Chemistry Department, College of science, Mustansiriyah University,Iraq.


The present work involves the synthesis and characterization of some transition elements complexes derived from (E)-3-((3-aminopyridin-2-yl) diazenyl)-4-hydroxy-2H-chromen-2-one as novel azo-Lewis base, LH. The new ligand was synthesized by coupling the diazonium salt of 2,6-diaminopyrimidine with alkaline solution of 4-hydroxy-coumarin. The new azo ligand was identified on the basis of C.H.N elemental analysis, EI-MS, NMR and FT-IR spectra. The direct reactions of hydrated chlorides of chromium(III),manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) with the [L] solution in ethanol solvent with variety of PH range of (7.5-8.0) and the mole ratio of ligand to metal ion 1:1 in all synthesized complexes. All the metal complexes were identified by flame atomic absorption spectroscopy, FT-IR and UV-Visible spectra. Furthermore the molar conductivity and magnetic susceptibility measurements were carried out to confirm their molecular formulas, and their geometry. The data observed from elemental analyses, electronic spectra and magnetic moments revealed the octahedral environment around Cr(III), Mn(II), cobalt(II) and copper(II) ions in the formulas [Cr(L)Cl2(H2O)]Cl, [M(L)Cl2(H2O)2], M=Mn(II),Co(II) and Cu(II) while the nickel(II) and zinc(II) complex were tetrahedral geometry [M(L)Cl2].nH2O ; M=Ni and Zn(II) and n=0 and 1 respectively. All the complexes were low soluble in DMF and sparingly in ethanol and common organic solvents which revealed the monomeric in nature structures of complexes and possessing metal-chloro bonding in the inner-sphere of complexes.


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