Effect of isopropyl side chain branching and different anions on electronic structure, vibrational spectra, and hydrogen bonding of isopropyl-imidazolium-based ionic liquids: Experimental and theoretical investigations
作者:Boumediene Haddad、Deepak K. Pandey、Dheeraj K. Singh、Annalisa Paolone、Mokhtar Drai、Didier Villemin、Serge Bresson
DOI:10.1016/j.saa.2023.122325
日期:2023.4
varying anion (Br–, BF4–, PF6–, and NTf2–) were synthesized and investigated by NMR, infrared (IR) and Raman spectroscopy. Based on infrared and Raman spectroscopy, complete vibrational assignments have been performed. The IR and Raman analysis revealed that the vibrational spectra are virtually unaffected upon methylation, while significant frequency changes were observed by changing anion. Furthermore
在目前的工作中,四支链甲基化 1,2-二甲基-3-异丙基-咪唑 (i-[C 3 Dmim + ]) 和质子化 1-甲基-3-异丙基-咪唑 (i-[C 3 mim + ]) 的离子液体 (IL) 具有不同的阴离子(Br –、BF 4 –、PF 6 –和 NTf 2 –) 合成并通过 NMR、红外 (IR) 和拉曼光谱进行研究。基于红外和拉曼光谱,已经完成了完整的振动分配。红外和拉曼分析表明振动光谱几乎不受甲基化的影响,而通过改变阴离子观察到显着的频率变化。此外,为了确定这些 i-[C 3 Dmim]Y、i-[C 3 mim]Y (Y = Br、BF 4、PF 6和 NTf 2) 离子对,包括色散校正方法在内的量子化学计算在单个离子和离子对上进行。通过分子中原子的量子理论 (AIM) 分析计算出的电子密度以揭示非共价离子内和离子间相互作用,并根据阴离子依赖性和相互作用类型进行解释。计算结果表明