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Four new dual-functional electro-catalysts formed of small molybdenum clusters and Cu-pyridyl complexes

Abstract

By changing N-heterocyclic ligands in the same Mo7/Cu/N-ligand reaction systems, four new organic-inorganic hybrids based on isopolymolybdates: [Cu2(tpy)2(β-Mo8O26)0.5(γ-Mo8O26)0.5]•0.25H2O (1), [Cu2(tpy)2(H2O)2(β-Mo8O26)] (2), [Cu(bpy)(Mo3O10)]•H2O (3), [Cu(bpy)(H2O)(β-Mo8O26)0.5]0.5 (4), (tpy = 2,2':6',2''-terpyridine, bpy = 2,6-bis(pyrazol-1-yl) pyridine), were prepared under hydrothermal methods at different pH. X-ray structural analyses shows that compound 1 has a 1D {-β-[Mo8O26]-Cu2-γ-[Mo8O26]}n straight chain structure with concomitant β-[Mo8O26] and γ-[Mo8O26] polyoxoanions; compound 2 possesses 3D supramolecular structure based on [Cu(tpy)]2+ motifs and β-[Mo8O26] clusters; compound 3 is 1D chain structure built from [Cu(bpy)]2+ and [Mo3O10]2- units. In compound 4, [β-Mo8O26] clusters are linked by [Cu(bpy)]2+ motifs to give rise to 2D sheet structure including {(β-Mo8O26)4Cu4} 8-membered rings. Cyclic voltammetries of compounds 1-4 display discrepant dual-functional electro-catalytic activities toward reduction of nitrite and oxidation of ascorbic acid in acid solution. Electrocatalytic tests indicate that [Mo3O10]2--based organic-inorganic hybrid exhibits better electro-catalytic performances than [Mo8O26]4--type hybrids towards oxidation and reduction.

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Supplementary files

Publication details

The article was received on 03 Sep 2019, accepted on 06 Oct 2019 and first published on 07 Oct 2019


Article type: Paper
DOI: 10.1039/C9DT03560E
Dalton Trans., 2019, Accepted Manuscript

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    Four new dual-functional electro-catalysts formed of small molybdenum clusters and Cu-pyridyl complexes

    W. Zhou, P. Liu, Y. Zheng, X. Liu, Y. Zhang, G. Yuan and J. Peng, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT03560E

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