Abstract: Four new nicke(Ⅱ) complexes containing the dianions of chloranilic acids(CA) which act as the bridging ligand in these complexes were synthesized, namely [Ni(phen)₂CA]₃·H₂O(1; phen=o-phenanthroline), [Ni₂(phen)₄CA](ClO₄)₂·2H₂O(2), [Ni(bpy)₂CA]·H₂O(3; bpy=2,2'-bipyridyl) and [Ni₂(bpy)₄CA](ClO₄)₂·2H₂O(4). They have been characterized by elemental analyses, IR, electronic spectra, ESR, susceptibility and variable-temperature magnetic susceptibility. Ni (Ⅱ) might display distorted octahedral coordination in the complexes. The variable-temperature magnetic susceptibilities of (2) and (4) were measured (4-300K). Based on the fact that as the temperature is lowered,μ_ell, gradually increases until a maximum is reached and then decreased, considering the combined effects of single-ion zero-field splitting(D) and interdimer interaction(Z'J'), the observed data were fitted to those from a modified Heisenberg model. The obtained parameters: J=100. 34, Z'J'=- 0. 382 for the complex(2); J=69. 66, Z'J'=- 0. 382 for the complex(4). The results indicate that there is a ferromagnetic intracluster interaction (positive J) and antiferromagnetic interdimer interaction (negative Z'J')

Key words: Binuclear complex, Dinickel(Ⅱ), Magnetism