Studies of a nickel-based single-molecule magnet.
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).
Andres
Hanspeter
H
Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Switzerland.
Basler
Reto
R
Blake
Alexander J
AJ
Cadiou
Cyril
C
Chaboussant
Gregory
G
Grant
Craig M
CM
Güdel
Hans-Ulrich
HU
Murrie
Mark
M
Parsons
Simon
S
Paulsen
Carley
C
Semadini
Fabrizzio
F
Villar
Vincent
V
Wernsdorfer
Wolfgang
W
Winpenny
Richard E P
RE