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- W1963715170 abstract "Reaction of [(Me3tacn)Cu(H2O)2]2+ (Me3tacn = N,N',N' '-trimethyl-1,4,7-triazacyclononane) with [TpFe(CN)3]- (Tp- = hydrotris(pyrazolyl)borate) in a mixture of ethanol and acetonitrile affords the pentanuclear cluster [Tp2(Me3tacn)3Cu3Fe2(CN)6]4+. Single-crystal X-ray analysis reveals a trigonal bipyramidal structure featuring a D3h-symmetry core in which two opposing FeIII (S = 1/2) centers are linked through cyanide bridges to an equatorial triangle of three CuII (S = 1/2) centers. Fits to variable-temperature dc magnetic susceptibility data are consistent with ferromagnetic coupling to give an S = 5/2 ground state, while fits to low-temperature magnetization data indicate the presence of a large axial zero-field splitting (D = -5.7 cm-1). Frequency dependence observed in the ac magnetic susceptibility data confirms single-molecule magnet behavior, with an effective spin reversal barrier of Ueff = 16 cm-1. When compared with the much lower anisotropy barrier previously observed for the face-centered cubic cluster [Tp8(H2O)6Cu6Fe8(CN)6]4+, the results demonstrate the enormous influence of the geometry in which a given set of metal ions are arranged." @default.
- W1963715170 created "2016-06-24" @default.
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- W1963715170 date "2006-05-12" @default.
- W1963715170 modified "2023-10-03" @default.
- W1963715170 title "Symmetry-Based Magnetic Anisotropy in the Trigonal Bipyramidal Cluster [Tp<sub>2</sub>(Me<sub>3</sub>tacn)<sub>3</sub>Cu<sub>3</sub>Fe<sub>2</sub>(CN)<sub>6</sub>]<sup>4+</sup>" @default.
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- W1963715170 doi "https://doi.org/10.1021/ja061788+" @default.
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