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Studies of a Nickel‐Based Single‐Molecule Magnet
Author(s) -
Andres Hanspeter,
Basler Reto,
Blake Alexander J.,
Cadiou Cyril,
Chaboussant Gregory,
Grant Craig M.,
Güdel HansUlrich,
Murrie Mark,
Parsons Simon,
Paulsen Carley,
Semadini Fabrizzio,
Villar Vincent,
Wernsdorfer Wolfgang,
Winpenny Richard E. P.
Publication year - 2002
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20021104)8:21<4867::aid-chem4867>3.0.co;2-r
Subject(s) - ferromagnetism , quantum tunnelling , condensed matter physics , inelastic neutron scattering , magnet , magnetization , ground state , nickel , exchange interaction , single molecule magnet , spin (aerodynamics) , field (mathematics) , molecule , quantum , chemistry , scattering , neutron scattering , physics , atomic physics , magnetic field , quantum mechanics , organic chemistry , mathematics , pure mathematics , thermodynamics
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 .