Dalton Transactions p. 16350 - 16357 (2019)
Update date:2022-08-10
Topics:
Zhou, Wanli
Liu, Ping
Zheng, Yanping
Liu, Xuekun
Zhang, Yong
Yuan, Gang
Peng, Jun
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), and [Cu(bpy)(H2O)(β-Mo8O26)0.5]0.5 (4) (tpy = 2,2′:6′,2′′-Terpyridine and bpy = 2,6-bis(pyrazol-1-yl) pyridine), were prepared using hydrothermal methods at different pH values. X-ray structural analysis shows that compound 1 has a 1D {-β-[Mo8O26]-Cu2-γ-[Mo8O26]}n straight chain structure with mixed β-[Mo8O26] and γ-[Mo8O26] polyoxoanions; compound 2 possesses a 3D supramolecular structure based on [Cu(tpy)]2+ motifs and β-[Mo8O26] clusters; and compound 3 has a 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 a 2D sheet structure including {(β-Mo8O26)4Cu4} 8-membered rings. Cyclic voltammograms of compounds 1-4 display discrepant dual-functional electro-catalytic activities toward the reduction of nitrite and the oxidation of ascorbic acid in acidic solution. Electrocatalytic tests indicate that the [Mo3O10]2--based organic-inorganic hybrid exhibits better electro-catalytic performances than [Mo8O26]4--Type hybrids towards oxidation and reduction.
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