Synthesis, crystal structure and magnetic properties of cubane and linear trinuclear nickel complexes formed by 3,5-dichloro-2-hydroxybenzylaminoacetic acid

The reaction of Ni(ClO4)(2)center dot 6H(2)O with 3,5-dichloro-2-hydroxy-benzylaminoacetic acid (H(2)dchaa), NaN3 and triethylamine in methanol solution or water solution under solvothermal methods leads to the formation of two completely different Ni-II compounds: [HN(C2H5)(3)](8)center dot[Ni-4(dchaa)(4)(N-3)(4)](2) (1) and [HN(C2H5)(3)](2)center dot[Ni-3(dchaa)(4)(H2O)(4)](2)center dot(H2O)(2) (2). The complexes 1 and 2 have been characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. Structure analyses reveal that complex 1 is a cubane cluster, while the complex 2 is a linear trinuclear cluster. The magnetic investigation shows that complexes 1 and 2 exhibit a ferromagnetic coupling between Ni-II ions. Ac susceptibilities of 1 and 2 reveal no frequency-dependent out-of-phase signals and the corresponding magnetic properties were discussed. (C) 2010 Elsevier B.V. All rights reserved.