An unprecedented molybdenum oxide based helical MOF with peroxidase-like activity synthesized by surfactant-thermal method

Here, a new three-dimensional molybdate-based metal-organic framework (MOF), [Zn-3(MoO4)(2)(trz)(2)(H2O)(2)] (1), (trz = 1,2,4-triazole) was successfully prepared by the surfactant-thermal method for the first time. Single crystal X-ray diffraction analysis reveals that the new compound possesses twofold meso-helical structure fabricated by Zn ions and trz ligand, and the inorganic MoO4-Zn nets insert into the helix arrays. In addition, Zn ions as their common junction stabilize the whole framework. As a kind of new peroxides mimic enzyme, the new compound can effectively catalyze the oxidation of the substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H2O2, accompanied by a obvious color varvation of solution (1 min responsed time). Moreover, the result of colorimetric sensing of H2O2 is that the H2O2 detection limit is 0.25 M, and the linear range is 1 to 80 mu M.