期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 9, 期 36, 页码 5018-5026出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b706497g
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We have studied temperature dependent IR spectra of the C-H stretching modes of the imidazolium ring in [bmim][PF6], [bmim][Tf2N], [emim][Tf2N], [hmim][Tf2N], and [bmim][BF4]. Temperatures in this study are from 278 to 348 K at an interval of 10 K. Spectra of the C-H stretching modes have been deconvoluted using our previous computer program of the Voigtlineshape function. Frequency shifts, Lorentzian spectral widths, and band absorbance were examined as a function of temperature. In order to interpret the observed behaviors, we have developed a simple mechanical model as well as a chemical equilibrium model. The model analyses suggest that enthalpy changes for the cluster and/or ion-pair breaking reactions in the liquid state are several kJ mol(-1) endothermic, and the degree of dissociations of ion pairs or hydrogen bonded clusters is in the range from 0.3 to 0.9 with different magnitudes for the five ionic liquids.
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