Raman Spectroscopic Study of the Vapor Phase of 1-Methylimidazolium Ethanoate, a Protic Ionic Liquid

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• 作者：Rolf W. Berg ; Jos N. Canongia Lopes ; Rui Ferreira ; Lus Paulo N. Rebelo ; Kenneth R. Seddon ; Alina A. Tomaszowska
• 刊名：Journal of Physical Chemistry A
• 出版年：2010
• 出版时间：October 14, 2010
• 年：2010
• 卷：114
• 期：40
• 页码：10834-10841
• 全文大小：249K
• 年卷期：v.114,no.40(October 14, 2010)
• ISSN：1520-5215

文摘

The gas phase over the ionic liquid 1-methylimidazolium ethanoate, [Hmim][O₂CCH₃], was studied by means of Raman spectroscopy. Raman spectra are presented, the species in the gas phase are identified, and their bands are assigned. The results are interpreted using ab initio quantum mechanical calculations that also predict vibrational spectra. The obtained data reinforce a previous interpretation, based on FT-ICR mass spectrometric data, that the vapor phase over [Hmim][O₂CCH₃] consists predominantly of two neutral molecules, monomeric ethanoic acid and 1-methylimidazole.