O(P-3) Atoms as a Probe of Surface Ordering in 1-Alkyl-3-methylimidazolium-Based Ionic Liquids

Carla Waring; Paul A. J. Bagot; John M. Slattery; Matthew L. Costen; Kenneth G. McKendrick

doi:10.1021/jz900247y

O(P-3) Atoms as a Probe of Surface Ordering in 1-Alkyl-3-methylimidazolium-Based Ionic Liquids

Carla Waring, Paul A. J. Bagot, John M. Slattery, Matthew L. Costen, Kenneth G. McKendrick

Chemistry

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

Abstract

We have investigated the reactivity of photolytically generated ground-state, gas-phase atomic oxygen O(P-3) with the surfaces of two related ionic liquids, 1-ethyl-3-methylimidazolium ([emim]) bis(trifluoromethyl-sulfonyl)imide ([NTf2]) and 1-dodecyl-3-methylimidazolium ([C(12)mim]) [NTf2]. The liquids differ only in the length of the alkyl side-chain on the cation. Laser-induced fluorescence was used to detect the gas-phase OH radicals formed at the gas-liquid interface. The considerable yield of OH from [C(12)mim][NTf2] in comparison to the undetectable amount from [emim][NTf2] cannot simply be explained by the difference in stoichiometry. We propose that this "chemical probe" method therefore provides strong evidence for the preferential accumulation of longer alkyl chains at the gas liquid interface.

Original language	English
Pages (from-to)	429-433
Number of pages	5
Journal	JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume	1
Issue number	1
DOIs	https://doi.org/10.1021/jz900247y
Publication status	Published - Jan 2010

Keywords

INELASTIC-SCATTERING DYNAMICS
SELF-ASSEMBLED MONOLAYERS
HYDROCARBON SURFACE
HYPERTHERMAL REACTIONS
MOLECULAR-DYNAMICS
ENERGY-TRANSFER
OXYGEN-ATOMS
INTERFACE
SQUALANE
SPECTROSCOPY

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title = "O(P-3) Atoms as a Probe of Surface Ordering in 1-Alkyl-3-methylimidazolium-Based Ionic Liquids",

abstract = "We have investigated the reactivity of photolytically generated ground-state, gas-phase atomic oxygen O(P-3) with the surfaces of two related ionic liquids, 1-ethyl-3-methylimidazolium ([emim]) bis(trifluoromethyl-sulfonyl)imide ([NTf2]) and 1-dodecyl-3-methylimidazolium ([C(12)mim]) [NTf2]. The liquids differ only in the length of the alkyl side-chain on the cation. Laser-induced fluorescence was used to detect the gas-phase OH radicals formed at the gas-liquid interface. The considerable yield of OH from [C(12)mim][NTf2] in comparison to the undetectable amount from [emim][NTf2] cannot simply be explained by the difference in stoichiometry. We propose that this {"}chemical probe{"} method therefore provides strong evidence for the preferential accumulation of longer alkyl chains at the gas liquid interface.",

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author = "Carla Waring and Bagot, {Paul A. J.} and Slattery, {John M.} and Costen, {Matthew L.} and McKendrick, {Kenneth G.}",

year = "2010",

month = jan,

doi = "10.1021/jz900247y",

language = "English",

volume = "1",

pages = "429--433",

journal = "JOURNAL OF PHYSICAL CHEMISTRY LETTERS",

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T1 - O(P-3) Atoms as a Probe of Surface Ordering in 1-Alkyl-3-methylimidazolium-Based Ionic Liquids

AU - Waring, Carla

AU - Bagot, Paul A. J.

AU - Slattery, John M.

AU - Costen, Matthew L.

AU - McKendrick, Kenneth G.

PY - 2010/1

Y1 - 2010/1

N2 - We have investigated the reactivity of photolytically generated ground-state, gas-phase atomic oxygen O(P-3) with the surfaces of two related ionic liquids, 1-ethyl-3-methylimidazolium ([emim]) bis(trifluoromethyl-sulfonyl)imide ([NTf2]) and 1-dodecyl-3-methylimidazolium ([C(12)mim]) [NTf2]. The liquids differ only in the length of the alkyl side-chain on the cation. Laser-induced fluorescence was used to detect the gas-phase OH radicals formed at the gas-liquid interface. The considerable yield of OH from [C(12)mim][NTf2] in comparison to the undetectable amount from [emim][NTf2] cannot simply be explained by the difference in stoichiometry. We propose that this "chemical probe" method therefore provides strong evidence for the preferential accumulation of longer alkyl chains at the gas liquid interface.

AB - We have investigated the reactivity of photolytically generated ground-state, gas-phase atomic oxygen O(P-3) with the surfaces of two related ionic liquids, 1-ethyl-3-methylimidazolium ([emim]) bis(trifluoromethyl-sulfonyl)imide ([NTf2]) and 1-dodecyl-3-methylimidazolium ([C(12)mim]) [NTf2]. The liquids differ only in the length of the alkyl side-chain on the cation. Laser-induced fluorescence was used to detect the gas-phase OH radicals formed at the gas-liquid interface. The considerable yield of OH from [C(12)mim][NTf2] in comparison to the undetectable amount from [emim][NTf2] cannot simply be explained by the difference in stoichiometry. We propose that this "chemical probe" method therefore provides strong evidence for the preferential accumulation of longer alkyl chains at the gas liquid interface.

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KW - SELF-ASSEMBLED MONOLAYERS

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KW - HYPERTHERMAL REACTIONS

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KW - ENERGY-TRANSFER

KW - OXYGEN-ATOMS

KW - INTERFACE

KW - SQUALANE

KW - SPECTROSCOPY

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JO - JOURNAL OF PHYSICAL CHEMISTRY LETTERS

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IS - 1

ER -

O(P-3) Atoms as a Probe of Surface Ordering in 1-Alkyl-3-methylimidazolium-Based Ionic Liquids

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Keywords

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