TY - JOUR
T1 - Confined rapid thermolysis/FTIR/ToF studies of imidazolium-based ionic liquids
AU - Chowdhury, Arindrajit
AU - Thynell, Stefan T.
N1 - Funding Information:
This material is based upon work supported by the U.S. Air Force Office of Scientific Research under Contract No. F49620-03-1-0211, with Dr. Michael Berman serving as the program manager. Funding for the purchase of the time-of-flight mass spectrometer by the U.S. Army Research Office under Contract No. DAAD19-01-1-0449, with Dr. David M. Mann serving as the program manager, is gratefully acknowledged.
PY - 2006/4/15
Y1 - 2006/4/15
N2 - 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.
AB - 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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U2 - 10.1016/j.tca.2006.01.006
DO - 10.1016/j.tca.2006.01.006
M3 - Article
AN - SCOPUS:33745472944
SN - 0040-6031
VL - 443
SP - 159
EP - 172
JO - Thermochimica Acta
JF - Thermochimica Acta
IS - 2
ER -