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Issue 42, 2010
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Studies of magnetic properties and HFEPR of octanuclear manganese single-molecule magnets

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Abstract

A new octanuclear manganese cluster [Mn8(Hpmide)4O4(EtCOO)6](ClO4)2 (1) is achieved by employing Hpmide as the ligand, and this paper examines the synthesis, X-ray structure, high-field electron paramagnetic resonance (HFEPR), magnetization hysteresis loops and magnetic susceptibilities. Complex 1 was prepared by two different methods, and hence, was crystallized in two space groups: P3221 for 1a and P3121 for 1b. Each molecule possesses four MnII and four MnIII ions. The metal-oxo framework of complex 1 consists of three face-sharing cubes with manganese ions on alternate corners. The four MnIII cations have their Jahn–Teller elongation axes roughly parallel to the c axis of the crystal lattice. The dc magnetic susceptibility measurements reveal a spin-frustration effect in this compound. The ac magnetic susceptibilities, as well as the magnetization hysteresis measurements, clearly establish that complex 1a is a single-molecule-magnet (SMM) with a kinetic energy barrier (10.4 cm−1) for spin reversal. HFEPR further confirms that complex 1a is a new SMM with a magnetoanisotropy and quantized energy levels. However, interpretation of the complete set of measurements in terms of a well defined spin ground state is not possible due to the spin frustration.

Graphical abstract: Studies of magnetic properties and HFEPR of octanuclear manganese single-molecule magnets

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Publication details

The article was received on 02 May 2010, accepted on 09 Aug 2010 and first published on 30 Sep 2010


Article type: Paper
DOI: 10.1039/C0DT00405G
Citation: Dalton Trans., 2010,39, 10160-10168
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    Studies of magnetic properties and HFEPR of octanuclear manganese single-molecule magnets

    C. Wu, S. Datta, W. Wernsdorfer, G. Lee, S. Hill and E. Yang, Dalton Trans., 2010, 39, 10160
    DOI: 10.1039/C0DT00405G

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