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Amperometric sensing and photocatalytic properties under sunlight irradiation of a series of Keggin–AgI compounds through tuning single and mixed ligands

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Abstract

By using a single conjugate ring-rich ligand La or Lb and mixed ligands La/Lb, eight Keggin–AgI-based compounds, namely [Ag4La5(SiW12O40)]·28H2O (1), [Ag3La4(PW12O40)] (2), [Ag3La2(H2O)(PW12O40)] (3), [Ag4Lb4(SiW12O40)] (4), [Ag3KLb4(SiW12O40)]·H2O (5), [Ag6Lb6(PMo12O40)2] (6), [Ag4LaLb3(C14H10O2)(SiW12O40)]·8H2O (7) and [Ag4La2Lb4(GeMo12O40)] (8) (La = 2,3-diphenylpyrazine, Lb = 2,3-diphenylquinoxaline, C14H10O2 = 1,2-diphenyl-ethane-1,2-dione), were successfully synthesized by controlling the reaction parameters and well established by single-crystal X-ray diffraction, elemental analyses, and IR spectra. Compounds 1–3 are based on the La ligand, while 4–6 are based on Lb. The mixed La/Lb ligands induce the formation of 7 and 8. In compound 1, the linear [Ag4La4]4+ subunits link SiW12 anions to form a chain. Two adjacent chains connect each other through POM anion bonds and a screw-like double track is built. Compound 2 is composed of 1D leaf-like AgI-La chains, which are further linked by anions to build a 2D grid-like layer. Compound 3 was obtained under the same conditions as 2 except at a different temperature. In 3, the inorganic double chains are connected by linear metal–organic clusters [Ag3La2]3+ and a 2D layer is formed. Compounds 4 and 5 were also obtained at different temperatures. In 4, the adjacent grid-like layers share the same Ag ions to construct a 3D framework. Compound 5 is composed of 1D cycle-connecting-cycle chains, which are further linked by anions and Ag ions to build a 3D structure. Compound 6 is a 3D framework, with dissociative anions accommodated in it. Compounds 7 and 8 are composed of mixed organic ligands La and Lb. Compound 7 has two kinds of chains, which are linked by anions to form a “ladder”. Compound 8 contains discrete anions and [Ag2LaLb2]2+ units. The title compound modified CPEs can act as amperometric sensors for detecting hydrogen peroxide, potassium bromate and potassium nitrite. Compounds 1–8 have excellent photocatalytic capacity for degradation of organic dyes MB and RhB under the sunlight irradiation.

Graphical abstract: Amperometric sensing and photocatalytic properties under sunlight irradiation of a series of Keggin–AgI compounds through tuning single and mixed ligands

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Publication details

The article was received on 22 Dec 2017, accepted on 13 Apr 2018 and first published on 18 Apr 2018


Article type: Paper
DOI: 10.1039/C7CE02214J
Citation: CrystEngComm, 2018, Advance Article
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    Amperometric sensing and photocatalytic properties under sunlight irradiation of a series of Keggin–AgI compounds through tuning single and mixed ligands

    A. Tian, J. Liu, T. Li, Y. Tian, G. Liu and J. Ying, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C7CE02214J

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