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Synthesis, Crystal Structure, Electrochemistry and Electro-Catalytic Properties of the Manganese-Containing Polyoxotungstate, [(Mn(H2O)3)2(H2W12O42)]6−

Abstract : We present the synthesis and structural characterization of the manganese-containing polyoxotungstate, [(Mn(H 2 O) 3) 2 (H 2 W 12 O 42)] 6− (1), obtained by reaction of MnCl 2 with six equivalents of Na 2 WO 4 in the presence of Zn(CH 3 COO) 2 in acetate medium (pH 4.7). This has been assessed by various techniques (FTIR, TGA, UV-Visible, XPS, elemental analysis, single crystal X-ray and electrochemistry). Single-crystal X-ray analyses showed that, in the solid state, 1 forms a 2-D network in which [H 2 W 12 O 42 ] 10− fragments are linked in pairs via Mn 2+ ions, leading to linear chains of the form [(Mn(H 2 O) 3) 2 (H 2 W 12 O 42)] n 6n−. The connection between chains occurs also via Mn 2+ ions which bind [H 2 W 12 O 42 ] 10− fragments belonging to two adjacent chains, forming an infinite 2-D network. A complete electrochemical study was done in aqueous solution where 1 is stable in the pH range 1 to 6. This complex undergoes multiple electron-transfer processes that lead to the electro-generation of manganese high oxidation state species that catalyse water electro-oxidation. 1 is also effective in the electro-catalytic reduction of nitrite and dioxygen.
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https://hal.univ-lorraine.fr/hal-02089707
Contributor : Alain Walcarius <>
Submitted on : Thursday, November 26, 2020 - 10:17:51 AM
Last modification on : Thursday, November 26, 2020 - 12:19:05 PM
Long-term archiving on: : Saturday, February 27, 2021 - 6:29:30 PM

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Anne-Lucie Teillout, Pedro de Oliveira, Jérôme Marrot, Robertha Howell, Neus Vilà, et al.. Synthesis, Crystal Structure, Electrochemistry and Electro-Catalytic Properties of the Manganese-Containing Polyoxotungstate, [(Mn(H2O)3)2(H2W12O42)]6−. Inorganics, MDPI AG, 2019, 7 (2), pp.15. ⟨10.3390/inorganics7020015⟩. ⟨hal-02089707⟩

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