Chemistry of tetra- and pentavalent chromium

Abstract

This review provides information on synthesis, reactivities, solid state properties, and electronic and molecular structure of chromium(IV) and chromium(V) compounds that have been isolated in pure form. Spectroscopic properties, especially EPR of Cr⁵⁺ and Cr⁴⁺ ions doped in various host lattices, are also discussed. However, compounds that generated in solution as transient species, or occured as intermediates in redox reactions, lie outside the scope of discussion. The types of compounds which received major consideration are: oxo-compounds, peroxo complexes, halo and oxyhalo complexes, alkoxides, amides, alkyls, hydroxy carboxylates and macrocyclic compounds. Literature through 1984 is covered. It will be apparent from this article that certain aspects of chromium(IV) and chromium(V) chemistry will get enriched in future.