Potassium, rubidium and ammonium salts of [mu]-(formato-[kappa]²O:O')-[mu]-oxido-bis­[oxidobis(peroxido-[kappa]²O,O')molybdate(VI)]

The unit-cell parameters of the three title salts, namely, tripotassium, K₃[Mo₂(CHO₂)O₃(O₂)₄], trirubidium, Rb₃[Mo₂(CHO₂)O₃(O₂)₄], and triammonium [mu]-(formato-[kappa]²O:O')-[mu]-oxido-bis­[oxidobis(peroxido-[kappa]²O,O')molybdate(VI)], (NH₄)₃[Mo₂(CHO₂)O₃(O₂)₄], which were all crystallized at pH 3, are quite similar, but the potassium and rubidium salt structures are noncentrosymmetric, whereas that of the ammonium salt is centrosymmetric. Formate acts as an O:O'-bridging ligand in the complex anion and is bound to a [mu]-oxido-bis(oxido­di­per­oxido­molybdate) unit.

Calcium and strontium salts of (glycinato-κ²N,O)oxidobis(peroxido-κ²O,O′)vanadate(V) tetra­hydrate

The calcium and strontium terahydrate salts of (glycinato)oxidobis(peroxido)vanadate(V) crystallized at pH ca 7.4 with similar lattice parameters. The glycinate anion acts as a bidentate N,O-chelating ligand, and the V atom has a penta­gonal bipyramidal geometry, with two η²-peroxide groups and the glycinate N atom in the equatorial plane, and one terminal oxo and a glycinate O atom at the axial positions.