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  • Title: Raising the spin-reversal barrier in cyano-bridged single-molecule magnets: linear Mn(III)(2)M(III)(CN)(6) (M = Cr, Fe) species incorporating [(5-Brsalen)Mn](+) units.
    Author: Choi HJ, Sokol JJ, Long JR.
    Journal: Inorg Chem; 2004 Mar 08; 43(5):1606-8. PubMed ID: 14989652.
    Abstract:
    Reactions between K(3)[M(CN)(6)] and [Mn(5-Brsalen)(H(2)O)(2)](+) (5-Brsalen = N,N'-ethylenebis(5-bromosalicylidene)aminato dianion) in a mixture of methanol and water afford the compounds K[(5-Brsalen)(2)(H(2)O)(2)Mn(2)M(CN)(6)].2H(2)O, with M = Cr (1) or Fe (2). The two compounds are isostructural, each containing a molecular cluster with a linear Mn(III)-NC-M(III)-CN-Mn(III) core and tetragonally elongated coordination about the Mn(III) centers. Magnetic data indicate the presence of weak exchange interactions within the clusters, giving rise to ground states of S = (5)/(2) and (9)/(2) with significant zero-field splitting. Despite the proximity of spin-excited states, ac susceptibility data reveal frequency-dependent out-of-phase signals characteristic of single-molecule magnets with spin-reversal barriers of U(eff) = 16 and 25 cm(-)(1), respectively.
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