NMR evidence of hydrogen bonding in 1-ethyl-3-methylimidazolium-tetrafluoroborate room temperature ionic liquid

Jing Fang Huang; Po Yu Chen; I. Wen Sun; S. P. Wang

doi:10.1016/S0020-1693(01)00477-7

NMR evidence of hydrogen bonding in 1-ethyl-3-methylimidazolium-tetrafluoroborate room temperature ionic liquid

Jing Fang Huang, Po Yu Chen, I. Wen Sun, S. P. Wang

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

The 1-ethyl-3-methylimidazolium-tetrafluoroborate (EMI-BF₄) room temperature ionic liquid was investigated with NMR techniques. Diffusion coefficients measured at temperatures ranging from 300 to 360 K indicate that phase-change occurred in the vicinity of 333 K, which is supported by ¹¹B quadrupolar relaxation rates. This phase change is ascribed to the transformation of the diffusion particle from 'discrete ion-pair' to 'individual ion' at temperatures above 335 K due to decomposition of the EMI-BF₄ ion pair. Analysis of the ¹³C dipole-dipole relaxation rates identifies the formation of hydrogen bond (C2H···F) between the counterions, EMI⁺ and BF₄^-. This hydrogen bonding may have significant contribution to the higher viscosity of this ionic liquid in comparison with the EMI-AlCl₄ ionic liquid at corresponding temperatures.

Original language	English
Pages (from-to)	7-11
Number of pages	5
Journal	Inorganica Chimica Acta
Volume	320
Issue number	1-2
DOIs	https://doi.org/10.1016/S0020-1693(01)00477-7
Publication status	Published - 2001 Aug 13

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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@article{9fe73ea030d8459abfe74c75e7ec211d,

title = "NMR evidence of hydrogen bonding in 1-ethyl-3-methylimidazolium-tetrafluoroborate room temperature ionic liquid",

abstract = "The 1-ethyl-3-methylimidazolium-tetrafluoroborate (EMI-BF4) room temperature ionic liquid was investigated with NMR techniques. Diffusion coefficients measured at temperatures ranging from 300 to 360 K indicate that phase-change occurred in the vicinity of 333 K, which is supported by 11B quadrupolar relaxation rates. This phase change is ascribed to the transformation of the diffusion particle from 'discrete ion-pair' to 'individual ion' at temperatures above 335 K due to decomposition of the EMI-BF4 ion pair. Analysis of the 13C dipole-dipole relaxation rates identifies the formation of hydrogen bond (C2H···F) between the counterions, EMI+ and BF4-. This hydrogen bonding may have significant contribution to the higher viscosity of this ionic liquid in comparison with the EMI-AlCl4 ionic liquid at corresponding temperatures.",

author = "Huang, {Jing Fang} and Chen, {Po Yu} and Sun, {I. Wen} and Wang, {S. P.}",

note = "Funding Information: The authors thank the National Science Council of the Republic of China, Taiwan for supporting of this work (Grant NSC89-2113-M006-035).",

year = "2001",

month = aug,

day = "13",

doi = "10.1016/S0020-1693(01)00477-7",

language = "English",

volume = "320",

pages = "7--11",

journal = "Inorganica Chimica Acta",

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number = "1-2",

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T1 - NMR evidence of hydrogen bonding in 1-ethyl-3-methylimidazolium-tetrafluoroborate room temperature ionic liquid

AU - Huang, Jing Fang

AU - Chen, Po Yu

AU - Sun, I. Wen

AU - Wang, S. P.

N1 - Funding Information: The authors thank the National Science Council of the Republic of China, Taiwan for supporting of this work (Grant NSC89-2113-M006-035).

PY - 2001/8/13

Y1 - 2001/8/13

N2 - The 1-ethyl-3-methylimidazolium-tetrafluoroborate (EMI-BF4) room temperature ionic liquid was investigated with NMR techniques. Diffusion coefficients measured at temperatures ranging from 300 to 360 K indicate that phase-change occurred in the vicinity of 333 K, which is supported by 11B quadrupolar relaxation rates. This phase change is ascribed to the transformation of the diffusion particle from 'discrete ion-pair' to 'individual ion' at temperatures above 335 K due to decomposition of the EMI-BF4 ion pair. Analysis of the 13C dipole-dipole relaxation rates identifies the formation of hydrogen bond (C2H···F) between the counterions, EMI+ and BF4-. This hydrogen bonding may have significant contribution to the higher viscosity of this ionic liquid in comparison with the EMI-AlCl4 ionic liquid at corresponding temperatures.

AB - The 1-ethyl-3-methylimidazolium-tetrafluoroborate (EMI-BF4) room temperature ionic liquid was investigated with NMR techniques. Diffusion coefficients measured at temperatures ranging from 300 to 360 K indicate that phase-change occurred in the vicinity of 333 K, which is supported by 11B quadrupolar relaxation rates. This phase change is ascribed to the transformation of the diffusion particle from 'discrete ion-pair' to 'individual ion' at temperatures above 335 K due to decomposition of the EMI-BF4 ion pair. Analysis of the 13C dipole-dipole relaxation rates identifies the formation of hydrogen bond (C2H···F) between the counterions, EMI+ and BF4-. This hydrogen bonding may have significant contribution to the higher viscosity of this ionic liquid in comparison with the EMI-AlCl4 ionic liquid at corresponding temperatures.

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SN - 0020-1693

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JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

IS - 1-2

ER -

NMR evidence of hydrogen bonding in 1-ethyl-3-methylimidazolium-tetrafluoroborate room temperature ionic liquid

Abstract

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