An S=3 cyanide-bridged tetranuclear (Fe2Ni2II)-Ni-III square that exhibits slow relaxation of magnetization: synthesis, structure and magnetic properties

作者：Wu, Dayu^*; Zhang, Yanjuan; Huang, Wei; Sato, Osamu

来源：Dalton Transactions, 2010, 39(23): 5500-5503.

DOI：10.1039/b925698a

• SINGLE-MOLECULE-MAGNET
• PRUSSIAN BLUE ANALOGS
• LOW-SPIN
• CLUSTERS
• CO
• COMPLEXES
• NI
• BEHAVIOR
• CAGE
• MN

The reaction of [Ni-II(dpa)(2)(solvent)](2+) (dpa = 2,2'-dipyridyl amine) with [Bu4N][(pzTp)Fe-III(CN)(3)] (Bu4N+ = tetrabutylammonium cation; pzTp = tetrakis(pyrazolyl)borate) in MeOH affords a tetranuclear cyano-bridged cluster, [(pzTp)(2)Fe2Ni2(dpa)(2)(CN)(6)](ClO4)(2)center dot 2CH(3)OH center dot 6H(2)O (1). Single-crystal X-ray analysis reveals that it is a quasi-square structure with the lateral distance being ca. 5.1 angstrom, in which two opposing dpa-ligated Ni-II ions (S = 1) are linked through cyanide bridges to two pzTp-ligated Fe-III (S = 1/2) centers at the corner sites. Magnetic studies for complex 1 show ferromagnetic coupling (J/k = 10.12 K) giving rise to an S = 3 ground state; ac magnetic susceptibility measurements performed on sample 1 showed evidence of the slow relaxation effects possibly associated with single-molecule magnet behavior.

• 出版日期2010-6-21
• 单位安庆师范大学