Synthesis, Crystal Structure and Magnetic Properties of a Ni(II) Supramolecular Complex Based on Aromatic Polycarboxylate Ligand

A Ni(II) supramolecular complex, [Ni-2(btec)(3PY)(2)(H2O)(8)](H2O)(4) (1), has been synthesized by Ni(ClO4)(2)center dot 6H(2)O, benzene-1,2,4,5-tetracarboxylic acid (Ribtec) and terminal ligand 3-hydroxypyridine (3py) in aqueous solution. The title compound crystallizes in triclinic system, space group P (1) over bar, with a = 8.5637(12), b = 9.4138(13), c = 10.3611(14) angstrom, alpha = 67.9540(10), beta = 85.1740(10), gamma = 76.9890(10)degrees, V = 754.33(18) angstrom(3), Z = 2, M-r = 386.96, D-c = 1.704 Mg/m(3), mu = 1.345. mm(-1), F(000) = 402, the final R = 0.0222 and wR = 0.0563 for 2675 observed reflections with I>2 sigma(I). The adjacent discrete molecules are further self-assembled by intermolecular pi-pi and O-H center dot center dot center dot O hydrogen bonding interactions to construct a 3D supramolecular framework. Magnetic measurement shows weak ferromagnetic interaction in the range of 2 similar to 300 K.