所有质子离子液体在气相中都以分子聚集体的形式存在吗？

Do all the protic ionic liquids exist as molecular aggregates in the gas phase?

机构信息

School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, PR China.

出版信息

Phys Chem Chem Phys. 2011 Oct 21;13(39):17445-8. doi: 10.1039/c1cp21817d. Epub 2011 Sep 7.

Abstract

According to an EI-MS study of 1,1,3,3-tetramethylguanidium-based protic ionic liquids (PILs), it has been concluded that not all PILs exist as molecular aggregates in the gas phase. The detection of both ions of m/z 115.0 and m/z 116.0 for the 1,1,3,3-tetramethylguanidinium trifluoromethylsulfonate (TMGS) protic ionic liquid indicates that both the molecular and ionic aggregates co-exist in the gas phase, which is to say that the TMGS may also evaporate via the ionic aggregates just like aprotic ionic liquids. Furthermore, investigation on triethylamine-based and 1-methylimidazole-based PILs confirmed that the gas phase structure of PILs depends on both the acidity and basicity of the corresponding acid and base.

摘要

根据对基于 1,1,3,3-四甲基胍的质子离子液体（PILs）的 EI-MS 研究，得出并非所有 PILs 在气相中都以分子聚集体的形式存在。对于 1,1,3,3-四甲基胍三氟甲磺酸酯（TMGS）质子离子液体，检测到 m/z 115.0 和 m/z 116.0 的两种离子，表明分子和离子聚集体在气相中共存，也就是说 TMGS 也可能像非质子离子液体一样通过离子聚集体蒸发。此外，对三乙胺基和 1-甲基咪唑基 PILs 的研究证实，PILs 的气相结构取决于相应酸和碱的酸度和碱度。