Pyrene-based ammonium bromides combined with g-C3N4 for the synergistically enhanced fixation reaction of CO2 and epoxides

Tao Chang; Xiaopeng Li; Yongjing Hao; Lianwei Kang; Tian Tian; Xiying Fu; Zheng Zhu; Balaji Panchal; Shenjun Qin

doi:10.1039/d1ra05328k

Pyrene-based ammonium bromides combined with g-C₃N₄ for the synergistically enhanced fixation reaction of CO₂ and epoxides

RSC Adv. 2021 Sep 10;11(48):30222-30228. doi: 10.1039/d1ra05328k. eCollection 2021 Sep 6.

Authors

Tao Chang^{1

2}, Xiaopeng Li¹, Yongjing Hao¹, Lianwei Kang¹, Tian Tian¹, Xiying Fu¹, Zheng Zhu¹, Balaji Panchal¹, Shenjun Qin¹

Affiliations

¹ Key Laboratory of CO2 Utilization of Handan City, College of Material Science and Engineering, Hebei University of Engineering Handan 056038 Hebei China tiantian19860102@126.com zhuzheng@hebeu.edu.cn sjqin528@hebeu.edu.cn.
² Key Laboratory of Heterocyclic Compounds of Hebei Province, Handan College Handan 056005 Hebei China.

Abstract

A new type of pyrene-based ammonium bromides (PABs) was synthesized via the reaction of bromomethyl pyrene and tertiary amines with different alkyl chains combined with graphitic carbon nitride (g-C₃N₄) through π-π stacking interactions. The new pyrene-based ammonium bromides were investigated both in homogenous phase and heterogeneous phase combining with g-C₃N₄ for the CO₂ fixation reaction of epoxides under mild conditions. Obviously, the combination was proved to be an efficient system for the conversion of epoxides. The interaction between g-C₃N₄ and PABs was confirmed by quantum chemical calculations. g-C₃N₄/Py-C₁₂ exhibited an excellent yield of cyclic carbonates (above 93%) at 80 °C, atmospheric pressure and solvent-free conditions. A preliminary kinetic study was performed using g-C₃N₄/Py-C₁₂ and the activation energy was calculated to be 61.5 kJ mol^-1.