The Synthesis and Characterization of N,N'-[4,4'-{Ethane-1,2-di-yl-bis(oxy)bis(4,1-phenylene)}bis(N'-hydroxy)-2-(hydroxyimino)-acetimidamide], (LH4) and Its Binuclear Complexes

摘要

A novel vic-dioxime ligand (LH4) and its transition metal complexes with Cu(AcO)2·H2O, Ni(AcO)2·4H2O, Co(AcO)2·4H2O and Cd(AcO)2 metal salts were synthesized. 1,2-Bis(p-aminophenoxy)ethane reacted with anti-chloroglyoxime to give N,N'-[4,4'-{ethane-1,2-di-yl-bis(oxy)bis(4,1-phenylene)}bis(N'-hydroxy)-2-(hydro-xyimino)acetimidamide] (LH4) ligand. Ligand forms binuclear complexes [(LH3)2M2(AcO)2]·nH2O with a 2:2 metal to ligand ratio, where M = Cu(II), Ni(II) and Cd(II), n = 2, 2 and 1, respectively. LH4 forms also binuclear Co(II) complex [(LH4)2Co2(AcO)4(H2O)2]·2H2O with a metal to ligand ratio of 2:2. The Ni(II) and Cd(II) complexes are proposed to be tetrahedral while the Cu(II) and Co(II) complexes should be octahedral. Structural assignments are supported by a combination of elemental analyses, UV-Vis, IR and H-NMR spectra, magnetic measurements and TGA and DTA techniques.