Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: March 26, 2024

Ionic polymers functionalized with hydroxyl, carboxyl, and amino groups can enhance the catalytic activity of catalysts. However, straightforward preparation bifunctional ionic containing abundant active sites hydrogen bond donors remains challenging. In this study, a series porous (BZIs) different (-NH₂, -OH, -COOH) were prepared through simple one-pot Friedel-Crafts alkylation using benzimidazole derivatives benzyl bromide. The structures properties BZIs characterized by various techniques such as Fourier-transform infrared spectroscopy, X-ray photoelectron solid-state nuclear magnetic resonance scanning electron microscopy. Among catalysts (BZI-NH₂, BZI-OH, BZI-COOH), BZI-NH₂ exhibited highest recyclability, achieving yield 97% in CO₂ cycloaddition. synergistic effect Br⁻, (-NH-, -NH₂), N⁺ was found to contribute its superior performance. DFT calculations employed study bonds, BZI-OH on Using an example, mechanism proposed for between bromide ions catalyzing cycloaddition reaction.

Language: Английский