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Issue 45, 2008
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Synthesis and characterisation of a Ni4 single-molecule magnet with S4 symmetry

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Abstract

[Ni4Cl4(HL)4] (1) {H2L[double bond, length as m-dash]HN(CH2CH2OH)2} has S4 symmetry and crystallises in the tetragonal space groupI41/a. Two exchange couplings are observed between the four Ni(II) centres, with J1 = 7.29 cm−1 and J2 = −2.08 cm−1, leading to an S = 4 ground state. The Ni4 complex shows the onset of frequency dependent signals in the out-of-phase ac susceptibility below 3 K. In single-crystal measurements carried out using a micro-SQUID, hysteresis loops are observed below 0.5 K, confirming that 1 shows slow relaxation of magnetisation. The loops are temperature dependent but only weakly sweep rate dependent due to the presence of small intermolecular interactions, which hinder quantum tunnelling. This exchange bias between Ni4 molecules is also seen in high-frequency high-field EPR measurements, which give the parameters D = −0.75 cm−1, B4° = −6.7 × 10−5 cm−1 and gz = 2.275.

Graphical abstract: Synthesis and characterisation of a Ni4 single-molecule magnet with S4 symmetry

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Publication details

The article was received on 02 May 2008, accepted on 15 Aug 2008 and first published on 08 Oct 2008


Article type: Paper
DOI: 10.1039/B807447J
Citation: Dalton Trans., 2008,0, 6409-6414
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    Synthesis and characterisation of a Ni4 single-molecule magnet with S4 symmetry

    A. Ferguson, J. Lawrence, A. Parkin, J. Sanchez-Benitez, K. V. Kamenev, E. K. Brechin, W. Wernsdorfer, S. Hill and M. Murrie, Dalton Trans., 2008, 0, 6409
    DOI: 10.1039/B807447J

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