文献类型：期刊文献

英文题名：Does the active hydrogen atom in the hydantoin anion affect the physical properties, CO₂ capture and conversion of ionic liquids?

作者：Chen, Tingting[1];Sun, Zhongyuan[1];Guo, Yujun[1];Xu, Yingjie[1,2]

机构：[1]Shaoxing Univ, Dept Chem, 508 Huancheng West Rd, Shaoxing 312000, Zhejiang, Peoples R China;[2]Zhejiang Engn Res Ctr Fat soluble Vitamin, 508 Huancheng West Rd, Shaoxing 312000, Zhejiang, Peoples R China

年份：2024

卷号：26

期号：17

起止页码：12957

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：SCI-EXPANDED(收录号：WOS:001204778100001)、、EI(收录号：20241715956029)、Scopus(收录号：2-s2.0-85190733289)、WOS

基金：This work was supported by the National Natural Science Foundation of China (No. 21978172).

语种：英文

外文摘要：Compared to the effect of the active hydrogen atom in the cation in protic ionic liquids (ILs) on their properties and applications, there are very few reports on the role of the active hydrogen atom in the anion. In order to better understand the role of the active hydrogen atom in the anion, the physical properties, CO2 capture and conversion of three hydantoin-based anion-functionalized ILs ([P-4442][Hy], [P-4442](2)[Hy], and [HDBU][Hy]) have been investigated via experiments, spectroscopy, and DFT calculations in this work. The results show that the active hydrogen atom in the anion can form anionic hydrogen bonding networks, which significantly increase the melting point and viscosity and decrease the basicity of the IL, thereby weakening its ability to capture and convert CO2. Interestingly, [P-4442][Hy] undergoes a solid/liquid two-phase transition during CO2 absorption/desorption due to the formation of quasi-intramolecular hydrogen bonding between the active hydrogen atom and the O- atom of the absorbed CO2, suggesting that the presence of the active hydrogen atom gives [P-4442][Hy] the potential to be an excellent molecular switch. As there is no active hydrogen atom in the anion of [P-4442](2)[Hy], it shows excellent CO2 capture and conversion performance through the double-site interaction. [HDBU][Hy] shows the weakest catalytic CO2 conversion due to the presence of active hydrogen atoms on both its anion and cation. Therefore, the active hydrogen atom in the anion may play a more important role in the properties and potential applications of ILs than the active hydrogen atom in the cation.