期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 122, 期 1, 页码 309-315出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.7b10671
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资金
- National High Technology Research and Development Program (863 Program) of China [SS2015AA020601]
- National Natural Science Foundation of China [21573196]
- Fundamental Research Funds of the Central Universities
The degree of proton transfer and thermodynamic parameters of six acetate-based protic ionic liquids (PILs) were measured using nuclear magnetic resonance spectroscopy and calculated by van't Hoff analytical method, respectively. The degree of proton transfer of these PILs at 298 K spread over a large range, which is from 39.6% (1-methylpyrrolidinium acetate, [MpyrH][AcO]) to 94.4% (1-butylimidazo-lium acetate, [BuimH][AcO]). The calculated standard. enthalpy change of the reaction (Delta H-r(m)theta) is from -23.30 to -7.80 kJ mol-(1 )and the standard entropy change of the reaction (Delta H-r(m))(theta) is from -42.70 to -8.07 J mol-K-1-(1) The correlation between the degree of proton transfer and aqueous Delta pK(a) or Delta(r)H(m)(theta)was investigated as well. Furthermore, in some special cases, Delta S-r(m)theta, especially the entropy change of symmetry, also plays an important role in affecting the degree of proton transfer.
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