Issue 20, 2020

Multi-functional photoelectric sensors based on a series of isopolymolybdate-based compounds for detecting different ions

Abstract

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, and H2bdpm = 1,1′-bis(3,5-dimethyl-1H-pyrazolate)methane), were obtained through traditional hydrothermal methods and fully characterized by single-crystal X-ray diffraction analysis and IR spectroscopy. Compounds 1 and 2 show one-dimensional (1D) and two-dimensional (2D) structures, respectively, containing metal–organic chains. Compounds 3–5 are 1D, 1D and 2D structures, respectively, including infinite Mo–O chains. The title compounds can act as bi-functional electrochemical sensors to detect not only NO2 anions but also Cr(VI) cations, and especially compound 3 shows an excellent detection range and sensitivity for Cr(VI) and NO2. Compound 3 also can act as a fluorescent sensor for the recognition of Hg2+. The fluorescence intensities can be reduced 65% by adding the solution of Hg2+ ions. So this series of POM-based compounds can be used as multi-functional photoelectric sensors for electrochemical sensing of NO2 and Cr(VI) and fluorescence sensing of Hg2+. Furthermore, the photocatalytic performances of compounds 1–5 were also studied.

Graphical abstract: Multi-functional photoelectric sensors based on a series of isopolymolybdate-based compounds for detecting different ions

Supplementary files

Article information

Article type
Research Article
Submitted
07 May 2020
Accepted
07 Aug 2020
First published
18 Aug 2020

Inorg. Chem. Front., 2020,7, 3882-3894

Multi-functional photoelectric sensors based on a series of isopolymolybdate-based compounds for detecting different ions

C. Wang, J. Ying, H. Mou, A. Tian and X. Wang, Inorg. Chem. Front., 2020, 7, 3882 DOI: 10.1039/D0QI00505C

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