Compounds of Molybdenum
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- Category: Molybdenum knowledge
- Published on 20 August 2013
- Written by 陈桂兰
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Compounds of molybdenum which are commonly encountered have molybdenum in its highest oxidation state, VI, for example molybdenum trioxide, MoO3, sodium molybdate, Na2MoO4.2H2O, and ammonium di- and heptamolybdate, (NH4)2Mo2O7 and (NH4)6Mo7O24.4H2O. In aqueous solution molybdenum(VI) is present as the simple molybdate, [MoO4] 2- ion which is like sulfate or, depending on the concentration and pH as a polymeric polymolybdate ion. The lower oxidation state, IV, is found in the commonest ore of molybdenum the disulfide, MoS2. Molybdenum(IV) also forms an oxide, MoO2. The redox chemistry of molybdenum-oxygen compounds, as in selective oxidation catalysts and molybdenum oxidase enzymes, has molybdenum cycling between oxidation states (VI) and (IV).
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