Studies of a nickel-based single-molecule magnet |
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| Authors: | Andres Hanspeter Basler Reto Blake Alexander J Cadiou Cyril Chaboussant Gregory Grant Craig M Güdel Hans-Ulrich Murrie Mark Parsons Simon Paulsen Carley Semadini Fabrizzio Villar Vincent Wernsdorfer Wolfgang Winpenny Richard E P |
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| Affiliation: | Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Switzerland. |
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| Abstract: | A cyclic complex [Ni(12)(chp)(12)(O(2)CMe)(12)(thf)(6)(H(2)O)(6)] (1) has been synthesised and studied (chp=6-chloro-2-pyridonate). Complex 1 exhibits ferromagnetic exchange between the S=1 centres, giving an S=12 spin ground state. Detailed studies demonstrate that it is a single-molecule magnet with an energy barrier of approximately 10 K for reorientation of magnetisation. Resonant quantum tunnelling is also observed. The field between resonances allows accurate measurement of D, which is 0.067 K. Inelastic neutron scattering studies have allowed exchange parameters to be derived accurately, which was impossible from susceptibility data alone. Three exchange interactions are required: two ferromagnetic nearest neighbour interactions of approximately 11 and 2 cm(-1) and an anti-ferromagnetic next nearest neighbour interaction of -0.9 cm(-1). |
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