Panja Sumit Kumar, Saha Satyen
Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
Magn Reson Chem. 2018 Feb;56(2):95-102. doi: 10.1002/mrc.4610. Epub 2017 Jun 16.
Existence of microheterogeneity of imidazolium and piperidinium cation-based ionic liquids (ILs) containing PF and NTf anions has been investigated by 1D and 2D NMR spectroscopy. 2D NMR (especially NOESY and HOESY) has been employed for studying the interactions present between cation and anion as well as the intermolecular interaction among cations. HOESY spectrum shows that fluorine of anion ( PF6- and NTf2-) significantly interacts with proton of the cations. Combined results of HOESY and NOESY for imidazolium IL indicate that the PF6- and imidazolium cation are distributed in organized manner, resulting a heterogeneous environment in liquid state. We have also observed existence of heterogeneous environment for piperidinium cation-based ILs which is different from imidazolium ILs. It appears that existence of microheterogeneity in IL is ubiquitous and therefore open up the ILs field to revisit. Copyright © 2017 John Wiley & Sons, Ltd.
通过一维和二维核磁共振光谱研究了含PF和NTf阴离子的咪唑鎓和哌啶鎓阳离子基离子液体（ILs）的微观不均匀性。二维核磁共振（特别是NOESY和HOESY）已用于研究阳离子与阴离子之间存在的相互作用以及阳离子之间的分子间相互作用。HOESY谱表明阴离子（PF6-和NTf2-）的氟与阳离子的质子有显著相互作用。咪唑鎓离子液体的HOESY和NOESY综合结果表明，PF6-和咪唑鎓阳离子以有序方式分布，导致液态下的非均相环境。我们还观察到哌啶鎓阳离子基离子液体存在与咪唑鎓离子液体不同的非均相环境。看来离子液体中微观不均匀性的存在是普遍的，因此为重新审视离子液体领域开辟了道路。版权所有©2017约翰威立父子有限公司。
