title: Unusual magnetic property associated with dimerization within a nickel tetramer.
abstract: A new ion-pair complex, 1-benzyl-4-aminopyridinium bis(maleonitriledithiolato)nickelate(III) (1), has been synthesized. The variable magnetic susceptibility results of 1 show a discontinuity around 184 K, which is phenomenologically similar to that observed for first-row transition metal complexes undergoing a spin crossover transition. The crystal structure analyses of 1 at high and low temperatures indicate that this unusual magnetic property is associated with a packing structure that changes from tetrameric spin clusters to dimers between neighboring spin carriers.
authors.affiliation: Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210093, P. R. China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Ren
authors.forename: Qingjin
authors.initials: Q
authors.lastname: Meng
authors.forename: You
authors.initials: Y
authors.lastname: Song
authors.forename: Chuanjiang
authors.initials: C
authors.lastname: Hu
authors.forename: Changsheng
authors.initials: C
authors.lastname: Lu
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Chen
authors.forename: Ziling
authors.initials: Z
authors.lastname: Xue