A New Cyclic Ligand and Complexes of Its Open-Chain Tautomer With Co(III) and Ni(II) Ions: Synthesis, Characterization and Thermal Properties

Abstract

A new ligand, 2−(p−tolyl)−1,2,3,4−tetrahydroquinazoline−2 −carbaldehyde oxime, was synthesized from a condensation reaction of oxo−p−tolyl−acetaldehyde oxime with 2−aminobenzyl- amine and then amine−imine−oxime complexes of this compound that formed with Co(III) and Ni(II) ions were obtained. All structures were characterized by spectral methods, elemental analysis, magnetic susceptibility, molar conductivity, and thermal analyses. The results that were obtained show that the cyclic ligand, HL, undergoes a ring−opening reaction upon complexation with metal ions. The Co(III) and Ni(II) complexes have a metal−ligand ratio of 1:2 and the imine ligand coordinates through the amine, imine, and oxime groups nitrogen atoms with metal ions.

Keywords:

• 2−(p−Tolyl)−1,2,3,4−tetrahydroquinazoline−2−car– baldehyde oxime
• amine−imine−oxime
• Co(III) comp- lex
• Ni(II) complex
• ring-chain tautomerism

Acknowledgments

This work was supported by the Technical and Scientific Research Council of Turkey, TUBITAK (Project No. 106T371) and the Research Foundation of Uludağ University (Project No. 2006/66).