Abstract
A new series of Mn(II), Ni(II), Co(II) and Cu(ll) complexes derived from diacetylmonoxime and 2-, 4- and 6-aminobenzoic acids have been prepared and characterised by elemental and thermal analyses (DTA, DTG and TG) as well as 1H and 13C NMR, IR, UV-Vis., Mass and ESR spectra, magnetic susceptibility and conductance measurements. The IR spectral data show that the ligands behave as mono- or di-basic, bis-, tri-, or tetradentate-chelates towards the metal ion. The stability of the complexes is achieved via intra- and inter-molecular hydrogen bonding of the OH-group with the oximato-oxygen atom or oxygen atom of a carboxylic group, giving polymeric networks in the solid state. Molar conductances in DMF solution indicate that the complexes are non-electrolytes. The ESR spectra of solid complexes [Co (HL1)21.2H2O (