Abstract
The dinuclear nickel(II) complex of an oxamide ligand reacted as a chelating ligand with transition metal cations to yield either tetra- or polymetallic complexes. The parent oxamido ligand is decadentate hexabasic and contains two symmetrical sets of N2O3 coordinating sites. The inner N2O3 sites of each set are coordinated to a nickel(II) cation. The outer O2O sites are available to coordinate to other metal cations. The reactions of the parent complex [(H2L)Ni2].EtOH with Ni(II), Co(II), Mn(II), UO2(VI) and Fe(III) cations yielded the following products: [LNi2M2Cl2(OH2)4], M = Ni(II) or Mn(II), [(HL)Ni2CoCl(OH2)2]n, [LNi2UO2(MeOH)]n and [LNi2Fe3Cl7(OH2)2]2. The products were characterized by elemental analyses, IR, UV-Visible and mass spectra. In addition the values of their magnetic moments indicated antiferromagnetic interactions between neighbouring metal cations. The magnetic exchange takes place via the oxamido linkage and either the chlorine and/or oxygen bridges. Referee I: T. C. Strekas Referee II: L. J. Boucher
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