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American Chemical Society, The Journal of Physical Chemistry A, 40(114), p. 10834-10841, 2010

DOI: 10.1021/jp1050639

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

Journal article published in 2010 by Rolf W. Berg, José N. Canongia Lopes ORCID, Rui Ferreira, Luís Paulo N. Rebelo ORCID, Kenneth R. Seddon, Alina A. Tomaszowska
This paper is available in a repository.
This paper is available in a repository.

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Abstract

The gas phase over the ionic liquid 1-methylimidazolium ethanoate, [Hmim][O(2)CCH(3)], 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][O(2)CCH(3)] consists predominantly of two neutral molecules, monomeric ethanoic acid and 1-methylimidazole.