Studies of chromium cages and wheels

Studies of two distinct classes of chromium(III) cage complexes are discussed. The first are compact oxo- and carboxylate cages, made by heating precursors to high temperature under a flow of nitrogen. One of these cages, [Cr 12O 9(OH) 3(O 2CCMe 3) 15], has an S = 6 spin ground state which proves a...

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Published inCoordination chemistry reviews Vol. 249; no. 23; pp. 2577 - 2590
Main Authors McInnes, Eric J.L., Piligkos, Stergios, Timco, Grigore A., Winpenny, Richard E.P.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2005
Subjects
Chromium cages
Magnetism
Structure formation
Synthetic methods
Synthetic methods
Magnetism
Chromium cages
Structure formation
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Summary:Studies of two distinct classes of chromium(III) cage complexes are discussed. The first are compact oxo- and carboxylate cages, made by heating precursors to high temperature under a flow of nitrogen. One of these cages, [Cr 12O 9(OH) 3(O 2CCMe 3) 15], has an S = 6 spin ground state which proves a very interesting subject for study by EPR and MCD spectroscopy. Use of other carboxylates leads to other octa- and dodeca-nuclear complexes. The second class of compounds are homo- and hetero-metallic wheels and chains bridged by fluoride and carboxylates. These include the first heterometallic anti-ferromagnetically coupled ring systems and are being widely studied in areas as diverse as magnetic cooling and quantum information processing. The mechanism by which these unusual cyclic and acyclic structures form is discussed.
ISSN:0010-8545
1873-3840
DOI:10.1016/j.ccr.2005.02.003