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Volumn 113, Issue 1, 2009, Pages 114-122

In situ attenuated total reflection infrared spectroscopy of imidazolium-based room-temperature ionic liquids under "Supercritical" CO2

Author keywords

[No Author keywords available]

Indexed keywords

ACIDS; DISSOLUTION; ELECTROMAGNETIC WAVE REFLECTION; FLUORINE; INFRARED SPECTROSCOPY; IONIZATION OF LIQUIDS; NEGATIVE IONS; ORGANIC POLYMERS; POSITIVE IONS; PROPYLENE; SOLUBILITY; SPECTROSCOPIC ANALYSIS; TERNARY SYSTEMS;

EID: 61949150148     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp800424d     Document Type: Article
Times cited : (100)

References (91)
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    • For principles of ATR-IR spectroscopy, see: a
    • For principles of ATR-IR spectroscopy, see: (a) Harrick, N. J. J. Phys. Chem. 1960, 64, 1110.
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    • For a recent review focusing on the application to heterogeneous catalysis, see
    • (c) For a recent review focusing on the application to heterogeneous catalysis, see: Bürgi, T.; Baiker, A. Adv. Catal. 2006, 50, 227.
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    • Bürgi, T.1    Baiker, A.2
  • 48
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    • Note that there are two definitions of the supercritical state of a pure fluid. In one definition the fluid becomes supercritical when it exceeds only the critical temperature, while in the other supercritical phase exists above both the critical temperature and pressure. We adopt the latter here. For example, see:, Jessop, P. G, Leitner, W, Eds, Wiley-VCH: Weinheim, Germany
    • Note that there are two definitions of the supercritical state of a pure fluid. In one definition the fluid becomes supercritical when it exceeds only the critical temperature, while in the other supercritical phase exists above both the critical temperature and pressure. We adopt the latter here. For example, see: Chemical Synthesis Using Supercritical Fluids; Jessop, P. G., Leitner, W., Eds.; Wiley-VCH: Weinheim, Germany, 1999.
    • (1999) Chemical Synthesis Using Supercritical Fluids
  • 53
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    • Purification method of the ionic liquids, particularly of relatively unstable [bmim][BF4] and [bmim][PF6, seems to be not established yet see ref 7i, Even the commercial products could contain the impurities and degradation products that affect the strict measurement of CO2 solubility. Water and halogen ions are typical impurities usually contained in ionic liquids, affecting the CO2 dissolution. Thus, their contents are also shown here, which were determined by Karl Fischer titration for water and ion chromatography for halide ions, where the limits of quantification in the ion chromatography were 10 mg L-1 for Cl, and 50 mg L-1 for Br, respectively; the detection limit for Br- was ca. 1 mg L-1. The contents of halide ions were extremely low, and their effect on the spectroscopy can be virtually neglected. The effect of water is discussed in section 3.1
    • -1. The contents of halide ions were extremely low, and their effect on the spectroscopy can be virtually neglected. The effect of water is discussed in section 3.1.
  • 57
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    • Note also that similar two bands were observed for 1-methyl-3-ethylimidazolium chloride-AlCl3 system and that the lower wavenumber band was disappeared by substituting the C-2 hydrogen with a methyl group, indicating that the ring NC(H)N, CH stretching band appears at a lower wavenumber. See ref 17
    • 3 system and that the lower wavenumber band was disappeared by substituting the C-2 hydrogen with a methyl group, indicating that the ring NC(H)N, CH stretching band appears at a lower wavenumber. See ref 17.
  • 72
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    • The [bmim][BF4]:propylene oxide:CO2 molar ratio may be also important for the reaction to take place. Peng and Deng performed the reaction using much lower amounts of [bmim][BF4, see ref 6a, which, however, lowers the intensity of [bmim][BF4] bands, making the spectra interpretation difficult
    • 4] bands, making the spectra interpretation difficult.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.