The crystal structure of dipyridinium µ-oxo-tetraperoxodioxobis(aquo)-dimolybdate(VI) and dipyridinium di-µ-hydroperoxo-tetraperoxo-dioxodimolybdate(IV)

Equilibria and dynamics of some aqueous peroxomolybdate catalysts: a 17O NMR spectroscopic study

“…In the calculations this signal could be explained by a Mo 2 X 6 2Ϫ (2,2,6,0) complex. This composition is in accordance with the crystal structure found by Le Carpentier et al 28 and Mitschler et al, 29 having four side-on (η 2 ) peroxo groups, two terminal oxygens and two bridging hydroperoxo (OOH) groups. The absence of a chemical shift change for the terminal oxygen signal in this pH-interval can be explained by the fact that there are no likely protonation sites on this complex, since the hydroperoxo groups cannot be protonated.…”

Peroxo and Superoxo Complexes of Chromium, Molybdenum, and Tungsten

“…94 The only confirmed "triperoxomolybdate" is the salt reported as (Hpy)2[Mo2Oii]-2H20293 and later shown to contain bridging hydroperoxo ligands, [MoO (02)2(00H) ] a2-. [95][96] As shown in Figure 5, the structure consists of a pair of edge-shared pentagonal bipyramids. Each hydroperoxo ligand occupies an axial position in one bipyramid and an equatorial position in the other with O-Mo distances of 2.39 and 2.04 A, respectively.…”