| Abstrakt: |
The stoichiometry of the reaction between Cu(II) and MoS42−in neutral aqueous solution was observed to proceed with a 1.5:1 Cu:Mo ratio. The reaction results in the reduction of Cu(II) and the quantitative formation of an insoluble solid. The results contrast with an earlier report of a 1:1 stoichiometric ratio, this latter ratio was, however, observed with CuII(albumin) as reactant, in this case no precipitate was observed. The insoluble products were examined by a number of spectroscopic techniques and by X-ray power diffraction and elemental analysis. Two products were identified. Solid Ais isostructural with the known (NH4)CuIMoVVIS4, i.e.has the composition MICuMoS4, MI= NH4+, Na+or Et4N+. Solid Bhas the approximate composition CuMoS4Ox, x=2−3 and contains Cu(I) and Mo(V) centres. Formation of compound Btherefore involves an unusual internal two-electron redox process. The reaction and products are of particular biological significance. |
