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Microheterogeneity in imidazolium and piperidinium cation‐based ionic liquids: 1D and 2D NMR studies
Author(s) -
Panja Sumit Kumar,
Saha Satyen
Publication year - 2018
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4610
Subject(s) - chemistry , ionic liquid , two dimensional nuclear magnetic resonance spectroscopy , nuclear magnetic resonance spectroscopy , intermolecular force , ion , proton , proton nmr , crystallography , stereochemistry , molecule , organic chemistry , catalysis , physics , quantum mechanics
Existence of microheterogeneity of imidazolium and piperidinium cation‐based ionic liquids (ILs) containing PF 6 and NTf 2 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 ( PF 6 − and NTf 2 − ) significantly interacts with proton of the cations. Combined results of HOESY and NOESY for imidazolium IL indicate that the PF 6 − 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.