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Piligkos S, Rajaraman G, Soler M, et al. Studies of an enneanuclear manganese single-molecule magnet. J Am Chem Soc. 2005;127(15):5572-80doi: 10.1021/ja042302x.
Piligkos, S., Rajaraman, G., Soler, M., Kirchner, N., van Slageren, J., Bircher, R., Parsons, S., Güdel, H. U., Kortus, J., Wernsdorfer, W., Christou, G., & Brechin, E. K. (2005). Studies of an enneanuclear manganese single-molecule magnet. Journal of the American Chemical Society, 127(15), 5572-80. https://doi.org/10.1021/ja042302x
Piligkos, Stergios, et al. "Studies of an enneanuclear manganese single-molecule magnet." Journal of the American Chemical Society vol. 127,15 (2005): 5572-80. doi: https://doi.org/10.1021/ja042302x
Piligkos S, Rajaraman G, Soler M, Kirchner N, van Slageren J, Bircher R, Parsons S, Güdel HU, Kortus J, Wernsdorfer W, Christou G, Brechin EK. Studies of an enneanuclear manganese single-molecule magnet. J Am Chem Soc. 2005 Apr 20;127(15):5572-80. doi: 10.1021/ja042302x. PMID: 15826195.
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J Am Chem Soc. 2005 Apr 20;127(15):5572-80. doi: 10.1021/ja042302x.

Studies of an enneanuclear manganese single-molecule magnet.

Journal of the American Chemical Society

Stergios Piligkos, Gopalan Rajaraman, Monica Soler, Nadeschda Kirchner, Joris van Slageren, Roland Bircher, Simon Parsons, Hans-Ulrich Güdel, Jens Kortus, Wolfgang Wernsdorfer, George Christou, Euan K Brechin

Affiliations

  1. School of Chemistry, The University of Edinburgh, West Mains Road, Edinburgh, EH9 3JJ, UK.

PMID: 15826195 DOI: 10.1021/ja042302x

Abstract

The reaction of [Mn(3)O(O(2)CMe)(6)(py)(3)] with the tripodal ligand H(3)thme (1,1,1-tris(hydroxymethyl)ethane) affords the enneanuclear complex [Mn(9)O(7)(O(2)CCH(3))(11)(thme)(py)(3)(H(2)O)(2)] 1.1MeCN.1Et(2)O. The metallic skeleton of complex 1 comprises a series of 10 edge-sharing triangles that describes part of an idealized icosahedron. Variable temperature direct current (dc) magnetic susceptibility data collected in the 1.8-300 K temperature range and in fields up to 5.5 T were fitted to give a spin ground state of S = (17)/(2) with an axial zero-field splitting parameter D = -0.29 cm(-)(1). Ac susceptibility studies indicate frequency-dependent out-of-phase signals below 4 K and an effective barrier for the relaxation of the magnetization of U(eff) = 27 K. Magnetic measurements of single crystals of 1 at low temperature show time- and temperature-dependent hysteresis loops which contain steps at regular intervals of field. Inelastic neutron scattering (INS) studies on complex 1 confirm the S = (17)/(2) ground state and analysis of the INS transitions within the zero-field split ground state leads to determination of the axial anisotropy, D = -0.249 cm(-)(1), and the crystal field parameter, B(4)(0) = 7(4) x 10(-)(6) cm(-)(1). Frequency domain magnetic resonance spectroscopy (FDMRS) determined the same parameters as D = -0.247 cm(-)(1) and B(4)(0) = 4.6 x 10(-)(6) cm(-)(1). DFT calculations are fully consistent with the experimental findings of two Mn(II) and four Mn(III) ions "spin up" and three Mn(IV) ions "spin down" resulting in the S = (17)/(2) spin ground state of the molecule, with D = -0.23 cm(-)(1) and U = 26.2 K.

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