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Role of the organic counterions on the protonation of Strandberg-type phosphomolybdates

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.

Auteur(s) : Lamine Yaffa, Antoine Blaise Kama, Mohamed Lamine Sall, Cheikh AK Diop, Mamadou Sidibé, Michel Giorgi, Mayoro Diop, Romain Gautier
Pages : 114795
Année de publication : 2020
Revue : Polyhedron
N° de volume : 191
Type : Article
Mise en ligne par : DIOP Cheikh Abdoul Khadir