Peculiarities of NMR relaxation in ionic liquids: Difficulties in interpretation and novel possibilities

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Abstract

An applicability of 13C and 1H relaxation rates (1/T 1) to direct calculations of the characteristic reorientation time (τc) in imidazolium-based ionic liquids has been analyzed. It has shown that 13C NMR relaxation technique can be applied to ionic liquids as successfully as it took place for other liquid systems and allows one to get τc values for each carbon directly. The corresponding 1H data are affected by dipole-dipole interaction only at “higher temperature” range while at lower temperatures spin-diffusion process controls the proton relaxation. Both carbon and hydrogen 1/T 1 dependences are suitable for calculation of τc and reveal equal numerical values for a number of functional groups of [emim]Ac at the proper temperature range. On the other hand, 1H relaxation curves of some functional groups allow one to detect motions, unobservable in the carbon relaxation and, thereby, to extract more information concerning details of the dynamics of the [amim]+ cations.

Original languageEnglish
Title of host publicationModern Problems of Molecular Physics - Selected Reviews from the 7th International Conference “Physics of Liquid Matter
Subtitle of host publicationModern Problems”, 2016
EditorsLeonid A. Bulavin, Alexander V. Chalyi
PublisherSpringer Nature
Pages51-66
Number of pages16
ISBN (Electronic)978-3-319-61109-9
ISBN (Print)9783319611082
DOIs
StatePublished - 2018
Event7th International Conference on Physics of Liquid Matter: Modern Problems, PLMMP 2016 - Kyiv, Ukraine
Duration: 27 May 201631 May 2016

Publication series

NameSpringer Proceedings in Physics
Volume197
ISSN (Print)0930-8989
ISSN (Electronic)1867-4941

Conference

Conference7th International Conference on Physics of Liquid Matter: Modern Problems, PLMMP 2016
Country/TerritoryUkraine
CityKyiv
Period27/05/1631/05/16

Scopus subject areas

  • Physics and Astronomy(all)

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