Synthesis, crystal structure and electrochemical properties of a new methylammonium sodium decavanate salt Na3(CH3NH3)3[V10O28].(CH3NH2).14H2O

• Published in: Journal of molecular structure Vol. 1254; p. 132321
• Main Authors: Yaffa, Lamine, Kama, Antoine Blaise, Fall, Balla, Traoré, Bocar, Diop, Cheikh A.K., Sidibé, Mamadou, Diop, Mayoro, Gautier, Romain
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-04-2022; Elsevier
• Subjects: Chemical Sciences; Decavanadate; Electrochemical property; Polyoxometalate; POMs; LMCT; CV; Epa; Polyoxometalate; Epc; Decavanadate; Electrochemical property; ATR
• ISSN: 0022-2860; 1872-8014; 0022-2860
• DOI: 10.1016/j.molstruc.2021.132321

•A new hybrid decavanadate type anion with mixed organic/inorganic counterions is synthetized.•The compound consists of the non-protonated decavanadate anion stabilized with a methylammonium/sodium cations.•The investigation of electrochemical properties shows two consecutive one-electron VV → VIV reductions.
A new hybrid decavanadate Na3(CH3NH3)3[V10O28].(CH3NH2).14H2O was obtained by a simple synthesis in solution and the crystal structure was determined by single-crystal X-ray diffraction. The compound consists of decavanadate anions [V10O28]6- isolated between sodium and methylammonium cations. The UV–Visible absorption, IR spectroscopy as well as electrochemical properties were characterized. The compound crystalizes in a triclinic system (space group P-1) with the unit cell parameters: a = 10.1584(11) Å, b = 10.8123(5) Å, c = 11.1582(7) Å, α = 107.723(4)°, β = 106.811(5)°, γ = 94.238(7)°. UV–Visible absorption spectroscopy shows a strong absorption band at 300 nm. The main IR absorption bands appear at: 954 cm-1, 800 cm-1, 732 cm-1 and 580 cm-1.
The electrochemical measurement of this compound shows two reversible one-electron redox process -105 mV (I-I’) and 335mV(II-II’), which was attributed to two consecutive one-electron VV → VIV reductions.
We successfully investigated the optical and electrochemical properties of a new hybrid Lindqvist decavanadate type compound Na3(CH3NH3)3(CH3NH2)[V10O28].14H2O which show two consecutive one-electron VV → VIV reductions.
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