title: Raman spectroscopic study of the vapor phase of 1-methylimidazolium ethanoate, a protic ionic liquid.
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.
authors.affiliation: Department of Chemistry, Technical University of Denmark, Building 207, Kemitorvet, DK-2800 Kgs. Lyngby, Denmark. rwb@kemi.dtu.dk
authors.forename: Rolf W
authors.initials: RW
authors.lastname: Berg
authors.forename: José N
authors.initials: JN
authors.lastname: Canongia Lopes
authors.forename: Rui
authors.initials: R
authors.lastname: Ferreira
authors.forename: Luís Paulo N
authors.initials: LP
authors.lastname: Rebelo
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Seddon
authors.forename: Alina A
authors.initials: AA
authors.lastname: Tomaszowska