Chromium, Molybdenum and Tungsten

This chapter reviews the literature reported during 2005 on some important advances in the areas of catalysis, bioinorganic, and organometallic chemistry for the chromium triad. For example, a complex with a five-fold chromium-chromium (Cr-Cr) bonding was reported for the very first time. A wide range of topics involving the bioinorganic chemistry of chromium(iii), molybdenum(vi), and tungsten(vi) are highlighted. Other highlights include (i) the production of gaseous H2 and hydrogenation of benzene by H 3PMo12O40, (ii) the very first example of a molecular square containing CuS2WS2Cu blocks, and (iii) the photoredox process of a Cr(vi)-Cr(iii)-oxalate system and its environmental relevance. © The Royal Society of Chemistry