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Issue 45, 2007
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Studies of a linear single-molecule magnet

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Reaction of the dinuclear complex [Mn2O2(bpy)4](ClO4)3 with H3cht (cis,cis-1,3,5-cyclohexanetriol) in MeCN produces the complex [Mn3(Hcht)2(bpy)4](ClO4)3·Et2O·2MeCN (1·Et2O·2MeCN). Dc magnetic susceptibility measurements reveal the existence of weak ferromagnetic exchange between the three Mn ions, leading to a spin ground state of S = 7, with D = −0.23 cm−1. W-Band (94 GHz) EPR measurements on restrained powdered crystalline samples confirm the S = 7 ground state and determine the ground state zero-field splitting (ZFS) parameters of D = −0.14 cm−1 and B40= +1.5 × 10−5 cm−1. The apparent 4th order behaviour is due to a breakdown of the strong exchange limit approximation (Jd, the single-ion ZFS). Single crystal dc relaxation decay and hysteresis loop measurements reveal the molecule to have an appreciable energy barrier to magnetization relaxation, displaying low temperature sweep rate and temperature-dependent hysteresis loops. Density functional studies confirm the ferromagnetic exchange coupling between the Mn ions.

Graphical abstract: Studies of a linear single-molecule magnet

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The article was received on 28 Aug 2007, accepted on 25 Sep 2007 and first published on 15 Oct 2007

Article type: Paper
DOI: 10.1039/B713163A
Citation: Dalton Trans., 2007,0, 5282-5289

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    Studies of a linear single-molecule magnet

    A. Prescimone, J. Wolowska, G. Rajaraman, S. Parsons, W. Wernsdorfer, M. Murugesu, G. Christou, S. Piligkos, E. J. L. McInnes and E. K. Brechin, Dalton Trans., 2007, 0, 5282
    DOI: 10.1039/B713163A

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