ic048367i_si_001.cif (100.5 kB)

Single-Molecule Magnets Constructed from Cyanometalates:  {[Tp*FeIII(CN)3MII(DMF)4]2[OTf]2}·2DMF (MII = Co, Ni)

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posted on 11.07.2005, 00:00 by Dongfeng Li, Sean Parkin, Guangbin Wang, Gordon T. Yee, Andrey V. Prosvirin, Stephen M. Holmes
Treatment of several divalent transition-metal trifluoromethanesulfonates [MII(OTf)2; MII = Mn, Co, Ni] with [NEt4][Tp*FeIII(CN)3] [Tp* = hydridotris(3,5-dimethylpyrazol-1-yl)borate] in DMF affords three isostructural rectangular clusters of {[Tp*FeIII(CN)3MII(DMF)4]2[OTf]2}·2DMF (MII = Mn, 3; Co, 4; Ni, 5) stoichiometry. Magnetic studies of 35 indicate that the Tp*Fe(CN)3- centers are highly anisotropic and exhibit antiferromagnetic (3 and 4) and ferromagnetic (5) exchange to afford S = 4, 2, and 3 spin ground states, respectively. ac susceptibility measurements suggest that 4 and 5 exhibit incipient single-molecule magnetic behavior below 2 K.