The synthesis and characterization of N-{2-[(1,4-dioxaspiro[4.5]-dec-2-ylmethyl)amino]ethyl}-N′-hydroxy-2-(hydroxyimino)ethanimidamide and some of its transition metal complexes

A new soluble vic-dioxime, N-{2-[(1,4-dioxzispiro[4.5]dec-2-ylmethyl)amino]ethyl}-N'-hydroxy-2-(hydroxyimino)ethammidamide (LH2) has been synthesized and mononuclear complexes have been obtained with Co(II), Ni(II), Cu(II) and Zn(II) salts. Different types of metal complexes, such as [Co(LH)(2)(H2O)(2)], [M(LH)(2)] (M = Ni(II) and Cu(II)) and [Zn(LH)(Cl)(H2O)], were obtained. Co(II), Ni(II) and Cu(II) form complexes with LH2 which have a metal ligand ratio of 1 : 2. Zn(II) forms a complex with H2L which has a metal-ligand ratio of 1 : 1. Structures of these compounds were identified by using elemental analyses, IR, H-1 and C-13 NMR spectra, electronic spectra, magnetic susceptibility measurements, conductivity measurements and thermogravimetric analyses (TGA).