Molecular Mobility in a Set of Imidazolium-Based Ionic Liquids [bmim] + A - by the NMR-Relaxation Method

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1 Citation (Scopus)

Abstract

The detailed investigation of the local mobility in a set of dried imidazolium-based ionic liquids (1-butyl-3-methylimidazolium) in a wide temperature range and varying anions (BF 4 - , I - , Cl - , Br - , NO 3 - , TfO - ) is presented. The measurements of temperature dependencies of the spin-lattice relaxation times of 1 H and 13 C nuclei are motivated by the need to obtain a fundamental characterization of molecular mobility of the substances under study, namely, to estimate the correlation times, τ c , for the motion of individual molecular groups. In particular, it follows from obtained results that the mobility of the hydrocarbon "tail" is higher (smaller τ c ) than that of the imidazole ring, and this expected tendency is quantified. The effect of the influence of an anion type on the cation mobility is also analyzed.

Original languageEnglish
Pages (from-to)2362-2372
Number of pages11
JournalJournal of Physical Chemistry B
Volume123
Issue number10
DOIs
Publication statusPublished - 14 Mar 2019

Fingerprint

Ionic Liquids
Ionic liquids
Anions
Negative ions
Nuclear magnetic resonance
nuclear magnetic resonance
Spin-lattice relaxation
liquids
Hydrocarbons
Relaxation time
Cations
Positive ions
anions
Temperature
imidazoles
spin-lattice relaxation
tendencies
hydrocarbons
relaxation time
cations

Scopus subject areas

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

@article{e9396e8fb4fa4e56a2766b67edd7169c,
title = "Molecular Mobility in a Set of Imidazolium-Based Ionic Liquids [bmim] + A - by the NMR-Relaxation Method",
abstract = "The detailed investigation of the local mobility in a set of dried imidazolium-based ionic liquids (1-butyl-3-methylimidazolium) in a wide temperature range and varying anions (BF 4 - , I - , Cl - , Br - , NO 3 - , TfO - ) is presented. The measurements of temperature dependencies of the spin-lattice relaxation times of 1 H and 13 C nuclei are motivated by the need to obtain a fundamental characterization of molecular mobility of the substances under study, namely, to estimate the correlation times, τ c , for the motion of individual molecular groups. In particular, it follows from obtained results that the mobility of the hydrocarbon {"}tail{"} is higher (smaller τ c ) than that of the imidazole ring, and this expected tendency is quantified. The effect of the influence of an anion type on the cation mobility is also analyzed.",
keywords = "ALKYL CHAIN-LENGTH, C-13 NMR, REORIENTATIONAL DYNAMICS, 1-ETHYL-3-METHYLIMIDAZOLIUM ACETATE, 1-BUTYL-3-METHYLIMIDAZOLIUM BROMIDE, PHYSICOCHEMICAL PROPERTIES, DIFFUSION-COEFFICIENTS, LITHIUM-SALTS, H-1, SPECTROSCOPY",
author = "Bystrov, {Sergei S.} and Matveev, {Vladimir V.} and Chernyshev, {Yurii S.} and Vytautas Balevičius and Chizhik, {Vladimir I.}",
year = "2019",
month = "3",
day = "14",
doi = "10.1021/acs.jpcb.8b11250",
language = "English",
volume = "123",
pages = "2362--2372",
journal = "Journal of Physical Chemistry B",
issn = "1520-6106",
publisher = "American Chemical Society",
number = "10",

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TY - JOUR

T1 - Molecular Mobility in a Set of Imidazolium-Based Ionic Liquids [bmim] + A - by the NMR-Relaxation Method

AU - Bystrov, Sergei S.

AU - Matveev, Vladimir V.

AU - Chernyshev, Yurii S.

AU - Balevičius, Vytautas

AU - Chizhik, Vladimir I.

PY - 2019/3/14

Y1 - 2019/3/14

N2 - The detailed investigation of the local mobility in a set of dried imidazolium-based ionic liquids (1-butyl-3-methylimidazolium) in a wide temperature range and varying anions (BF 4 - , I - , Cl - , Br - , NO 3 - , TfO - ) is presented. The measurements of temperature dependencies of the spin-lattice relaxation times of 1 H and 13 C nuclei are motivated by the need to obtain a fundamental characterization of molecular mobility of the substances under study, namely, to estimate the correlation times, τ c , for the motion of individual molecular groups. In particular, it follows from obtained results that the mobility of the hydrocarbon "tail" is higher (smaller τ c ) than that of the imidazole ring, and this expected tendency is quantified. The effect of the influence of an anion type on the cation mobility is also analyzed.

AB - The detailed investigation of the local mobility in a set of dried imidazolium-based ionic liquids (1-butyl-3-methylimidazolium) in a wide temperature range and varying anions (BF 4 - , I - , Cl - , Br - , NO 3 - , TfO - ) is presented. The measurements of temperature dependencies of the spin-lattice relaxation times of 1 H and 13 C nuclei are motivated by the need to obtain a fundamental characterization of molecular mobility of the substances under study, namely, to estimate the correlation times, τ c , for the motion of individual molecular groups. In particular, it follows from obtained results that the mobility of the hydrocarbon "tail" is higher (smaller τ c ) than that of the imidazole ring, and this expected tendency is quantified. The effect of the influence of an anion type on the cation mobility is also analyzed.

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KW - C-13 NMR

KW - REORIENTATIONAL DYNAMICS

KW - 1-ETHYL-3-METHYLIMIDAZOLIUM ACETATE

KW - 1-BUTYL-3-METHYLIMIDAZOLIUM BROMIDE

KW - PHYSICOCHEMICAL PROPERTIES

KW - DIFFUSION-COEFFICIENTS

KW - LITHIUM-SALTS

KW - H-1

KW - SPECTROSCOPY

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U2 - 10.1021/acs.jpcb.8b11250

DO - 10.1021/acs.jpcb.8b11250

M3 - Article

C2 - 30779569

AN - SCOPUS:85062873666

VL - 123

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EP - 2372

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

SN - 1520-6106

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