Journal
COORDINATION CHEMISTRY REVIEWS
Volume 249, Issue 21-22, Pages 2391-2407Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ccr.2005.03.029
Keywords
chromium(VI); coordination geometry; intermediates; structure; spectroscopy
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In this review, the speciation of chromium(VI) entities, the key to understanding the further redox processes related to this ion, is presented and discussed. Two possible modes of Cr(VI) binding, i.e. as a centre of coordination and as a ligand, have been characterized. In contrast to the gas and solid-state phases, where coordination number four is generally preserved, the Cr(VI) coordination sphere may be more flexible and chromium(VI) forms can even be seven-coordinate in solution. In the solid state, the pseudotetrahedral stereochemistry of the [CrO4](2-) species does not exclude versatility of its coordination modes, e.g. monodentate, polymeric bridging, bidentate, chelate, etc. The difficulties and various problems associated with structural aspects of Cr(VI) forms, mainly in relation to their spectroscopic properties, are shown. (c) 2005 Elsevier B.V. All rights reserved.
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