Abstract
By using multinuclear 1H, 13C, 17O, 95Mo and 183W magnetic resonance spectroscopy (1-D and 2-D), aldonic acids, alduronic acids and aldaric acids have been found respectively to form one, four and three homologous oxoperoxo complexes with MoVI and WVI, in aqueous solution (pH range 2–11). Common features are the involvement of two peroxide units per metal centre and the co-ordination of the sugar acids through carboxylate and adjacent hydroxyl groups. Accordingly, 1∶1∶2 (metal∶acid∶peroxide) complexes are detected as well as 2∶1∶4 species in the case of the aldaric acids. The geometry around each MO4+ centre is approximately pentagonal bipyramidal, the MO group occupying one of the apical positions and the two peroxo ligands being equatorial. The sugar acid is co-ordinated in one equatorial and in one apical site.
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