摘要:
The homodinuclear Cu(II) complex, [(H2L)Cu-2].2H(2)O, of an axamido ligand, 1,6-di(o-hydroxyphenyl)-4, 7, 10, 13-tetraza-3,14-dimethyl-2,14,-diene-1,8,9,16-hexadecatetraone, H6L, was used as a chelating agent towards metal cations. Homo- and heterotetranuclear and polynuclear complexes of the types [LCu2M2Cl2]. xH(2)O or [(HL)Cu2MCl(OH)(2)](2) . xH(2)O (M = Cu(II), Ni(II), Mn(II) or Co(II)), [(Hl)Cu-2(UO2)(1/2)(H2O)(1/2)](2) . 6H(2)O, [LCu2Fe4Cl10(OH2)(4)]. 8H(2)O and [LCu2Fe2(O4S)(2)(MeOH)(2)](n) are obtained. Addition of LiOH as a deprotonating agent plays an important rule in producing different products. In addition, on changing the molar ratios of the reactants, different complexes were obtained. The products were characterized by chemical analyses, UV-Visible, IR and ESR spectroscopy, mass spectrometry and magnetic moment determinations. Antiferromagnetic interactions between adjacent metal cations were observed and are attributed to the effect of the oxamido linkage and chloride or oxygen bridges in transferring magnetic effects between different metalic cations in the complex molecules.