摘要:
Three new tetranuclear nickel(II) complexes of general formula [Ni-4(L)(2)(N-3)(2)(CH3COO)(2)(CH3O)(2)](2)center dot xCH(3)OH center dot yH(2)O (HL = HL1, HL2 and HL3; x = 0, y = 1 for 1; x = 2, y = 0 for 2 and x = 2, y = 4 for 3) were synthesized and characterized by single crystal X-ray diffraction and magnetic measurements. Single crystal X-ray studies reveal that all three complexes exhibit similar tetranuclear face-shared defective double-cubane structure, having azido-, alk/phenoxido- and acetato-bridges. Magnetic susceptibility measurements on the complexes in the range of 300-2 K indicate ferromagnetic coupling between the metal ions. The slightly different magnetic behaviors observed are probably caused by subtle structural differences between the respective [Ni4O4N2] cores induced by ligand variation. (C) 2011 Elsevier B. V. All rights reserved.