Studies of chromium cages and wheels |
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Authors: | Eric JL McInnes Grigore A Timco Richard EP Winpenny |
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Institution: | a Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK b Institute of Chemistry, Moldova Academy of Sciences, Chisinau, Republic of Moldova |
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Abstract: | 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, Cr12O9(OH)3(O2CCMe3)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. |
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Keywords: | Chromium cages Synthetic methods Structure formation Magnetism |
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