期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 290, 期 -, 页码 55-60出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2004.11.159
关键词
clusters; molecular magnetism; spin frustration; electron paramagnetic resonance
The magnetic properties of the first odd-member antiferromagnetic ring comprising eight chromium(III) ions, S =2/3 spins, and one nickel(II) ion, S = 1 spin, are investigated. The ring possesses an even number of unpaired electrons and a S = 0 ground state but, due to competing AF interactions, the first excited spin states are close in energy. The spin frustrated ring is visualized by a Mobius strip. The knot of the strip represents the region of the ring where the AF interactions are more frustrated. In the particular case of this bimetallic ring electron paramagnetic resonance (EPR) has unambiguously shown that the frustration is delocalized on the chromium chain, while the antiparallel alignment is more rigid at the nickel site. (c) 2004 Elsevier B.V. All rights reserved.
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