The reaction of [NiII(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)2Fe2Ni 2(dpa)2(CN)6](ClO4) 2·2CH3OH·6H2O (1). Single-crystal X-ray analysis reveals that it is a quasi-square structure with the lateral distance being ca. 5.1 Å, in which two opposing dpa-ligated Ni II ions (S = 1) are linked through cyanide bridges to two pzTp-ligated FeIII (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.
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