Synthesis and peroxidase-like mimic study in H₂O₂ detection of a stable polyoxometalate-pillared coordination polymer

Abstract

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.

Keywords:

• polyoxometalate
• coordination polymer
• pore
• peroxidase-like activity
• H₂O₂ detection

Additional information

Funding

This work was financially supported by the Science and technology research project of Heilongjiang Province Education Department (12541797).