THE SYNTHESIS AND Co(II), Co(III), Cu(II), Ni(II) AND UO2(VI) COMPLEXES OF A NEW SYMMETRICAL vic-DIOXIME CONTAINING 1,3-DIOXOLANE

Abstract

9,10-bis(hydroxyimino)-4,8,11,15-tetraaza-1,2,17,18-O-dibenzal octadecane (LH2) was synthesized starting from 1,2-O-benzal-4-aza-7-aminoheptane, which was prepared from reaction of l-chloro-2,3-O-benzal propane and dichloroglyoxime. The structure of this novel vicinal (vic) dioxime has been determined as the (E, E) form by 1H NMR, 13C NMR and IR data. Mono-nuclear complexes with a metal-ligand ratio of 1:2 have been prepared with Co(II), Cu(II) and Ni(II). In the case of uranyl, UO2(VI) salt was used and the metal-ligand ratio was found to be 1:1. In addition, a Co(III)(py)Cl complex of the ligand was prepared with pyridine (py) and chloride as axial ligands. The structures of the ligand and its complexes are proposed based on elemental analysis, IR, 1H NMR and 13C spectra, magnetic susceptibility measurements, thermogravimetric analyses (TGA) and differential thermal analyses (DTA).