✍ Scribed by Stuart H. Laurie
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A large number of thiometallate anions, MO x S 4-x n-, and some of the seleno analogues, are known in which M is a transition metal in a high oxidation state. They are characterised by their strong colours arising from low energy S(Se)ǞM charge transfer transitions, by unusual redox properties and by their ability to act as ligands to produce a wide range of heterometal complexes. This review outlines some of these properties associated with the thiometallate anions of molybdenum(VI). These anions are prepared by passing H 2 S through an alkaline molybdate solution, giving a sequential replacement of O atoms by S and ultimately MoS 4 2-(TTM) as product. The thiomolybdates, particularly TTM, have been the most intensively studied because of their ease of preparation, their relatively greater thermal and hydrolytic stabilities and their biological roles. Unusual redox changes which involve internal electron transfer have been shown by reaction with organic disulfides and with Cu II . In the latter case insoluble polymeric products are readily formed which, from EPR and EXAFS studies, involve S-bridged reduced Cu MICROREVIEWS: This feature introduces the readers to the authors' research through a concise overview of the selected topic. Reference to important work from others in the field is included.
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