Confined rapid thermolysis/FTIR/ToF studies of imidazolium-based ionic liquids

Arindrajit Chowdhury, Stefan T. Thynell

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Rapid scan FTIR spectroscopy and time-of-flight (ToF) mass spectrometry were utilized to study thermal decomposition of three imidazolium-based ionic liquids, with 1-ethyl-3-methyl-imidazolium (emim) as the cation, and NO3-, Cl-, and Br- as the anions. The thermal decomposition involved heating rates of 2000 K/s and temperatures to 435 °C in an ambient inert gas at 1 atm. Using sub-milligram quantities of each compound, examinations of the evolution of gas-phase species revealed that the most probable sites for proton transfer and subsequent secondary reactions were primarily the methyl group and secondarily the ethyl group. The ring appeared to remain intact, as there was no evidence of the formation of HCN, imines or related products. The most reactive compound is [emim]NO3, since the nitrate group served as a strong oxidizer and reacted strongly with the methyl/ethyl groups at the elevated temperatures to produce common final products from combustion.

Original languageEnglish (US)
Pages (from-to)159-172
Number of pages14
JournalThermochimica Acta
Volume443
Issue number2
DOIs
StatePublished - Apr 15 2006

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Ionic Liquids
Thermolysis
Ionic liquids
Pyrolysis
Noble Gases
Proton transfer
Imines
liquids
Inert gases
Heating rate
Nitrates
thermal decomposition
Anions
Mass spectrometry
Cations
Negative ions
Gases
Positive ions
Spectroscopy
Temperature

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

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abstract = "Rapid scan FTIR spectroscopy and time-of-flight (ToF) mass spectrometry were utilized to study thermal decomposition of three imidazolium-based ionic liquids, with 1-ethyl-3-methyl-imidazolium (emim) as the cation, and NO3-, Cl-, and Br- as the anions. The thermal decomposition involved heating rates of 2000 K/s and temperatures to 435 °C in an ambient inert gas at 1 atm. Using sub-milligram quantities of each compound, examinations of the evolution of gas-phase species revealed that the most probable sites for proton transfer and subsequent secondary reactions were primarily the methyl group and secondarily the ethyl group. The ring appeared to remain intact, as there was no evidence of the formation of HCN, imines or related products. The most reactive compound is [emim]NO3, since the nitrate group served as a strong oxidizer and reacted strongly with the methyl/ethyl groups at the elevated temperatures to produce common final products from combustion.",
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Confined rapid thermolysis/FTIR/ToF studies of imidazolium-based ionic liquids. / Chowdhury, Arindrajit; Thynell, Stefan T.

In: Thermochimica Acta, Vol. 443, No. 2, 15.04.2006, p. 159-172.

Research output: Contribution to journalArticle

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