SYNTHESES AND COMPLEXES OF UNSYMMETRICAL MULTI-DENTATE LIGANDS .1. BIDENTATE GLYOXALANIL(1)-PHENYLHYDRAZONE-(2) LIGANDS

The synthesis of a series of new unsymmetrical bidentate ligands is described. they are obtained by stepwise condensation of the two carbonyl groups of glyoxal with firstly phenylhydrazine, and secondly a primary amine. The non-charged complexes of these ligands of the type [M(LH)2]° (where LH = deprotonated ligand residue) for M = Cu(II), Ni(II) and Co(II) have been isolated and studied. A series of copper compounds of formula CunligX((n+1)) (where n = 2, 3 or 4 and X = Cl or Br) have also been obtained, and are postulated as mixed Cu(I) and Cu(II) compounds. © 1979.