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- W4309476502 abstract "Electrochemical detection of water contaminants driven by polyoxometalate-based materials provides a promising approach for environmental safety and diseases prevention. Herein, three polyoxotungstate-based supramolecular complexes were synthesized with formulas of [Cd3(H2O)2(trz)6][HSiW12O40]2·17H2O (1), [Cd(imi)6]2[SiW12O40]·24H2O (2), [Himi]4[SiW12O40]·H2O (3), (Htrz = 1-H-1,2,4-triazole; imi = Imidazole), which were employed as multifunctional sensors for the detection of various contaminants in water. Structural analysis showed that in compound 1, the trinuclear cadmium cluster [Cd3(Htrz)6]6+ links [SiW12O40]4- anion to form a dumbbell-shaped fragment, which interacts with each other via abundant hydrogen bonds to extend the structure into three-dimensional supramolecular network. In compound 2, the windmill-shaped [Cd(imi)6]2+ cations interact with [SiW12O40]4- anion via electrostatic interactions and hydrogen bonding to form 3-D supramolecular structure. Compound 3 displays an ‘inorganic core-organic hell’ hybrid supramolecular structure constructed by [SiW12O40]4- anion cluster and four protonated organic [Himi]+ cations. Three compounds as electrochemical sensors exhibited favorable electrocatalytic activities for the detection of hexavalent chromium Cr(VI), NO2− and H2O2 with remarkable anti-interference capacity. As for the determination of Cr(VI), compound 1 shows the lowest limit of detection (LOD) of 0.86 μM and high sensitivity of 39.3 μA mM−1 among three compounds, which meets the WHO standard for the minimum concentration of Cr(VI) in drinking water (less than 0.962 μM). Moreover, the LODs of compound 1 towards NO2− and H2O2 detection are 3.74 μM and 1.39 μM along with sensitivities of 4.81 μA mM−1 for NO2− ion and 37.2 μA mM−1 for H2O2, respectively. This work provides some important insights into the design of efficient POMs-based electrochemical sensors for environmental applications." @default.
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- W4309476502 date "2023-01-01" @default.
- W4309476502 modified "2023-10-12" @default.
- W4309476502 title "Polyoxotungstate-based supramolecular complexes as multifunctional electrocatalysts for sensing water contaminants" @default.
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- W4309476502 doi "https://doi.org/10.1016/j.jssc.2022.123717" @default.
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