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. [ABSTRACT FROM AUTHOR]