Synthesis and Magnetic Properties of Dinuclear Cu (II) -M II (M = Cu, Ni) Complexes of [14]N ₄ Macrocyclic Oxamides

Four new dinuclear complexes of [14] N ₄ macrocyclic oxamides have been synthesized and characterized, namely [Cu(μ-L ¹)ML ² ₂] (CIO ₄) ₂ middot; H ₂O, where L ¹ is 2, 3-dioxo-5, 6: 13, 14-dibenzo -1, 4, 8, 11-tetraazacyclotetradeca-7, 11-diene; L ² is ethylenediamine (en), M = Cu(1), M = Ni (2) ; L ² is 1, 10-phenanthroline(phen), M = Cu(3), M = Ni(4). The temperature dependence of the magnetic susceptibility of (3) and (4) has been studied over the range 4. 2 - 300K, giving the exchange intergral J = - 99. 1cm ^-1 (3) and J = - 47. 0cm ^-1 (4). The results are commensurate with strong antiferromagnetic interactions between Cu ^II and Cu ^II or Ni ^II ions.