Synthesis and peroxidase-like mimic study in H2O2 detection of a stable polyoxometalate-pillared coordination polymer
A stable hamburger-like polyoxometalate (POM)-pillared coordination polymer (CP) [Ag15(trz)10][SiW12O40] (Ag15SiW12) (trz = 1,2,3-triazole) has been synthesized and characterized. Single crystal X-ray diffraction (SCXRD) analysis indicates that SiW12 polyanions are sandwiched between adjacent Ag-trz sheets with two distinct types of pores, giving a three-dimensional POM-pillared sheet framework. Inspired by the reported horseradish peroxidase (HRP) and other enzyme mimics, the peroxidase-like activity of Ag15SiW12 was investigated to catalyze oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H2O2. Compared with other POM-involved enzyme mimics, Ag15SiW12 exhibits excellent peroxidase-like activity. Detection of H2O2 was also studied in buffer solution, and the result shows broader application range (1–100 μM), faster response time (1 min) and lower detection limit (0.27 μM), which may be ascribed to the distinct structure and maximized synergistic effect of individual components.
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