Abstract
Strandberg-type phosphomolybdate anions are metal-oxide clusters with general formula [HnP2Mo5O23](6−n)− (n = 0, 1, 2). The protonation/deprotonation of this anion affects its redox properties. Herein, we explain how to select the organic counterions to direct the synthesis towards the non-protonated or protonated anion. The method is illustrated with the synthesis of two new compounds (C5H16N2)3[P2Mo5O23]·4H2O (1) and (CH6N)4[H2P2Mo5O23].CH5N·4H2O (2). The two compounds were characterized by UV–Visible absorption, IR spectroscopy and single crystal X-ray diffraction. Their thermal stabilities and redox properties were also investigated.
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