首页|Triphenylimidazolium-incorporated,benzbisimidazole-linked porous organic polymers as efficient catalyst for CO2 conversion
Triphenylimidazolium-incorporated,benzbisimidazole-linked porous organic polymers as efficient catalyst for CO2 conversion
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NSTL
The cycloaddition of CO2 to epoxides is now becoming one of the most important CCVfixation reactions due to the 100% atom efficiency together with the wide application of cyclic carbonates.However,such a cycloaddition reaction often requires efficient catalysts owing to the intrinsically inert nature of CO2.Herein,we report the synthesis of triphenylimidazolium-incorporated,benzbisimidazole-linked porous organic polymer(namely PBPI-IL)by polycondensation of 1,2,4,5-benzenetetramine with triphenylimidazole-containing tetraaldehyde followed by post-treatment with iodomethane.The as-synthesized PBPI-IL2 network with intact benzbisimidazole ring possesses an ionization degree of 31.94 mol% and a specific surface area of 350 m~2 g~(-1),which is capable of efficiently catalyzing the cycloaddition of CO2 to epoxides,i.e.,99% conversion and 99% selectivity in the transformation of epichlorohydrin at 60 ℃ under atmospheric CO2 pressure.Moreover,the PBPI-IL2 network can be readily recycled and reused for at least 6 times.The highly catalytic activity of PBPI-IL2 network can be ascribed to the H-bonding interaction between benzbisimidazole ring and epoxides,the Lewis base-Lewis acid and ju-ju bonding interactions between benzbisimidazole ring and CO2 molecule,as well as the high nucleophi-licity of I~ anion.
NSTL
