Ferromagnetic [Mn3] Single-Molecule Magnets and Their Supramolecular Networks
Ross Inglis A , Giannis S. Papaefstathiou B , Wolfgang Wernsdorfer C and Euan K. Brechin A DA School of Chemistry, West Mains Road, The University of Edinburgh, Edinburgh, EH9 3JJ, UK.
B Laboratory of Inorganic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 157 71 Zogragfou, Greece.
C Institut Néel, CNRS & Université J. Fourier, BP 166, 38042 Grenoble, France.
D Corresponding author. Email: ebrechin@staffmail.ed.ac.uk
Australian Journal of Chemistry 62(9) 1108-1118 https://doi.org/10.1071/CH09236
Submitted: 23 April 2009 Accepted: 16 June 2009 Published: 17 September 2009
Abstract
The complexes [MnIII3O(Et-sao)3(O2CPh(Cl)2)(MeOH)3(H2O)] (1), [MnIII3O(Et-sao)3(ClO4)(MeOH)3] (2), [MnIII3O(Et-sao)3(O2Ph(CF3)2)(EtOH)(H2O)3] (3), and [MnIII3O(Ph-sao)3(O2C-anthra)(MeOH)4]·Ph-saoH2 (4·Ph-saoH2) display dominant ferromagnetic exchange interactions leading to molecules with S = 6 ground states. The molecules are single molecule magnets (SMM) displaying large effective energy barriers for magnetization reversal. In each case their crystal structures reveal multiple intermolecular H-bonding interactions. Single crystal hysteresis loop measurements demonstrate that these interactions are strong enough to cause a clear field bias, but too weak to transform the spin networks into classical antiferromagnets. These three-dimensional networks of exchange coupled SMMs demonstrate that quantum tunnelling magnetization can be controlled using exchange interactions, suggesting supramolecular chemistry can be exploited to modulate the quantum physics of molecular magnets.
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