Sorry, you need to enable JavaScript to visit this website.

Multiple points of view of heteronuclear NOE: Long range vs short range contacts in pyrrolidinium based ionic liquids in the presence of Li salts

TitleMultiple points of view of heteronuclear NOE: Long range vs short range contacts in pyrrolidinium based ionic liquids in the presence of Li salts
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2015
AuthorsCastiglione, F., Appetecchi Giovanni Battista, Passerini S., Panzeri W., Indelicato S., and Mele A.
JournalJournal of Molecular Liquids
Volume210
Pagination215-222
ISSN01677322
KeywordsFluorosulfonylimide, Heteronuclear, Intermolecular NOE, Ionic liquids, Liquids, Lithium, Nuclear magnetic resonance, Nuclear magnetic resonance spectroscopy, Pyrrolidinium, Trifluoromethanesulfonimide
Abstract

The nuclear Overhauser enhancement (NOE) is a powerful tool of NMR spectroscopy extensively used to gain structural information in ionic liquids (ILs). A general model for the distance dependence of intermolecular NOE in ILs was recently proposed showing that NOE spots beyond the first solvation shell and accounts for long-range effects. This conclusion prompted for a deep rethinking of the NOE data interpretation in ILs. In this paper we present an extensive and quantitative study of N-propyl-N-methyl pyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR13TFSI), the homologue with bis(fluorosulfonyl)imide (PYR13FSI), and their mixtures with LiTFSI based on 1H-19F and 1H-7LiNOE correlation experiments (HOESY). The former is mainly tuned on long-range interactions, the latter on short-range ones, due to the small and large Larmor frequency differences of the involved nuclei. The collected data are discussed in two different way: long-range 1H-19FNOEs spot on the polar/apolar domains within the ILs, whereas short-range (e.g. regarding the first coordination shell) 1H-7LiNOEs describe the contacts between first neighbors, with interesting correlation with the distances' statistics derived by crystallographic data of related systems. © 2015 Elsevier B.V.All rights reserved.

Notes

cited By 1

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84940613626&doi=10.1016%2fj.molliq.2015.05.036&partnerID=40&md5=4cdcc197d0690b1c13cd2f8969ea5bcb
DOI10.1016/j.molliq.2015.05.036
Citation KeyCastiglione2015215