Five new polyoxometalate(POM)-based compounds, namely [CuII4(btmc)(ctcm)4(β-Mo8O26)]·[β-Mo8O26]·H2O (1), [CuII4(mct)2(ctcm)2(H2O)6(β-Mo8O26)]·[β-Mo8O26] (2), [CuII(dm4bt)(Mo3O10)] (3), [CoII(dm4bt)(Mo2O7)] (4) and [CoII(H2bdpm)(Mo2O7)] (5) (btmc = 1,4-bis(1,2,4-triazol-1-methyl)cyclohexane, mct = 4-(4-Methyl-cyclohexylmethyl)-4H-[1,2,4]triazole, ctcm = C-(4-[1,2,4]Triazol-4-ylmethyl-cyclohexyl)-methylamine, dm4bt = 2,2′-dimethyl-4,4′-bithiazole, H2bdpm =...

By introducing a series of pyridine derivatives as organic moiety, four Keggin-based compounds were synthesized, namely [Ag(Py2Piz)2(H2PW12O40)]·2H2O (1), [Ag4(AcyPh)4(H2SiMo12O40)2]·2H2O (2), [Ag2(Py3Piz)2(H2O)2(H3SiMo12O40)2]·6H2O (3) and {Ag4(Py2TTz)4[Ag(PMo12O40)2]}·Ag(Py2TTz)·2(Py2TTz)·6H2O (4) (Py2Piz = 4,5-Bis(2-pyridinyl)imidazole, Py3Piz =...

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Through the use of two kinds of imidazole derivatives containing different O-functional units, three new Keggin- and one Wells-Dawson-polyoxometalate (POM)-based compounds, namely [Cu2La4(HPW12O40)] (1), [CuLa4(H2O)2(HPMo12O40)] (2), [Cu2La7(H2O)(H2P2W18O62)]·La(3), [Ag2(Lb4)(HPMo12O40)]·Lb·H2O (4)(La= (4-(2,5-dihydro-1H-imidazol-1-yl)benzaldehyde), and Lb=(4-(2,5-dihydro-1H-imidazol-1-yl)benzoic acid), were synthesized and characterized using single-crystal X-ray diffraction, elemental analyses, and infrared spectroscopy. The polyoxoanions occupy holes framed by two symmetrically oriented CuLa2 units in 1. In compound 2, the square-planar CuLa4 units form a two-dimensional (2D), supramolecular grid through π···π stacking interactions. The POMs occupy vacancies in this grid. In compound 3, the CuLa3 subunits connect the neighboring P2W18 units and an “S”-type chain is formed. Through hydrogen bonding interactions, the chains are connected to form a layer. In compound 4, the POM anions are linked by AgLb2 subunits to form a chain. All the chains are tied together to construct a layer structure with weak hydrogen bonding interactions between the terminal carboxylic acid functional groups of ligands Lb. The electrocatalytic and photocatalytic activities of all these four compounds were also studied.

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