SYNTHESIS OF NEW BISAMIDOXIME LIGANDS AND THEIR MONOCHARGED METAL-COMPLEXES

This paper describes the synthesis of two new bisamidoxime ligands wit h dithioether connecting groups. The ligands were obtained from ethane dithiol in two steps; i) cyanoalkylation ii) oximation with hydroxyla mine. Cyanoalkylation of ethanedithiol was carried out by condensing w ith chloro acetonitrile and base-catalysed addition of acrylonitrile, yielding bis(cyanomethylthio) ethane and bis(cyanoethyl thio) ethane, respectively. Upon subsequent oximation with hydroxylamine, these bisn itrile compounds gave corresponding bis(amidoxime) ligands in reasonab le yields. The ligands behave as tetradentate ligands and on interacti on with Cu(II), Ni(II), Co(II) chlorides produces monocharged metal co mplexes in a [ML](+) Cl- composition.