Triazinyl-imidazole polyamide network as an efficient multi-hydrogen bond donor catalyst for additive-free CO2 cycloaddition

A single-component synergistic catalytic system, in which multiple active sites act on a substrate with minimal energy input and promote efficient conversion of the substrate, is considered to be the most advanced technology for simulating enzyme catalytic reaction . The design principles of this technology are the driving force behind the pursuit of cost-effectiveness in industrial production, but the challenges remain formidable. Herein, three periodic mesoporous polyamides with triazine-derived networks (PMP-TDNs) were prepared via "one-pot" polycondensation , and used as non-metallic catalysts for cycloaddition of CO 2 with epoxides without any additives to synthesis cyclic carbonates. The composition and physicochemical properties of PMP-TDNs were evaluated via different analytical methods to explore the crucial factors affecting catalytic activity. Especially, the activity of PMP-TDNs-MI with multiple hydrogen bond donor (HBD) and high-density N basic sites have been tested effectually; the results has demonstrated a superior reactivity for the cycloaddition of CO 2 and a wide range of epoxides with reusability. The kinetics and thermodynamics of cycloaddition of CO 2 with propylene epoxide by PMP-TDN S -MI were investigated, and the cooperative catalytic mechanism between the versatile active sites of catalyst was revealed based on the experimental results.