A novel synthesis route for preparation of tetrazole-based infinite coordination polymers and their application as an efficient catalyst for Michael addition reactions

摘要

In this study, synthesis of a tetrazole-based infinite coordination polymer (Zn(btb)) with and without ultrasonic irradiation was investigated. The infinite coordination polymer (ICP) containing Zn2+ metal node and a multidentate organic ligand (btb = 1,3-bis(tetrazol-5-ylmethyl)-benzene) has been developed. Influences of sonication conditions on the morphology and size of the Zn(btb) ICPs were studied for the first time. These ICPs were characterized by scanning electron microscopy, transmission electron microscopy, CHN elemental analysis, powder X-ray diffraction, dynamic light scattering and FT-IR spectroscopy. Influences of some parameters such as power, sonication time and concentration of the initial reagents on the size and morphology of ICPs were studied. Moreover, using conventional method for synthesis of Zn(btb) ICPs leads to low product yield and long synthesis time. In this study, we report the synthesis of Zn( btb) ICPs in high yield by sonochemical method. In addition, Zn( btb) ICPs were introduced as an efficient heterogeneous catalyst for Michael addition of 1-methylpyrrole to electrondeficient alpha,beta-unsaturated ketones and beta-nitrostyrenes for the first time.