Thiomolybdate anions structure

The reactions of oxomolybdates [(Mo04) or (M07O24) ] with H2S or CNH4)2S t under basic conditions give thiomolybdate products that, depending on reaction times or conditions, contain Mo=S and Mo=0 units in various combinations (42). The chemistry and spectroscopic properties of the tetrahedral (MoS 04 anions have been reviewed (43-45) and the structures of various thiomolybdates have been determined (46). 

The thiomolybdate(VI) anions [MoO S4 ] (n = 0-3) have been prepared by a number of methods and, with the exception of [MoOsS] ", act as versatile ligands to a wide variety of metal ions (see Table 1). In each of the compounds listed in this table, the [MoO S4- p ion acts as a bidentate ligand to the metal and the resultant structural versatility has been clearly demonstrated for copper(I) (Table 2). In addition, thiomolybdate(VI) anions are of interest since they have special relevance to aspects of bioinorganic chemistry. Thus, [MoS4] has been widely used in the synthesis of Fe—Mo—S clusters, examples of which serve as spectroscopic analogues for the iron-molybdenum cofactor of the nitrogenases (see Section 36.6.2), and Cu—Mo—S aggregates, which are relevant to the copper deficiency induced by molybdenum in ruminant animals. 

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