Assembly of polyoxometalate-templated metal-organic framework with effective peroxidase-like catalytic activity

Abstract

A new polyoxometalate (POM)-templated 3-D copper(II)-triazole framework [Cu₁₀(trz)₁₀(OH)₆(Cl)₄][H₃PW₁₂O₄₀]·2H₂O (trz = 1,2,3-triazole) has been synthesized and characterized by single crystal X-ray diffraction and other routine methods. The 3-D POM/copper(II)-triazole hybrid framework with a 1-D channel possesses a pcu topology under the template of bulk Keggin-type phosphotungstate. As a new kind of peroxidase mimetic, the new compound effectively catalyzed oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H₂O₂. The electrostatic interactions and hydrogen bonds/π-π stacking interactions among TMB, trz, and phosphotungstate are responsible for the enhancement of peroxidase-like activity. In addition, application for colorimetric sensing of H₂O₂ is also explored; the new compound exhibits a wide linear range (1–80 μM), low detection limit (0.21 μM), and fast response (2 min).

Keywords:

• Polyoxometalate
• metal-organic framework
• template
• peroxidase-like activity

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

Financial support from the Talent Culturing Plan for Leading Disciplines of University and University Scientific Research Project (J17KA118) and the Natural Science Foundation (ZR2017LB001) of Shandong Province, students’ research and innovative experiment program of Jining University (cx201815).