Potassium, rubidium and ammonium salts of μ-(formato-κ2O:O′)-μ-oxido-bis[oxidobis(peroxido-κ2O,O′)molybdate(VI)]

Abstract

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 μ-(formato-κ2O:O′)-μ-oxido-bis[oxidobis(peroxido-κ2O,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 anO:O′-bridging ligand in the complex anion and is bound to a μ-oxido-bis(oxidodiperoxidomolybdate) unit.