The infrared absorption spectra of two ionic liquids with bis(trifluoromethanesulfonyl)-imide (TFSI) as an anion and ammonium with different alkyl chains as cations are reported as a function of temperature. Using the comparison with ab initio calculations of the infrared-active intramolecular vibrations, the experimental lines were ascribed to the various ions composing the ionic liquids. In the liquid state of the samples, both conformers of the TFSI ion are present. In the solid state, however, the two conformers survive in N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)imide (TMPA-TFSI), while only cis-TFSI is retained in N-trimethyl-N-hexylammonium bis(trifluoromethanesulfonyl)imide (TMHA-TFSI). We suggest that the longer alkyl chains of the former compound stabilize the less stable conformer of TFSI by means of stronger interactions between anions and cations.

Stabilization of different conformers of bis(trifluoromethanesulfonyl)imide anion in ammonium-based ionic liquids at low temperatures / F., Vitucci; Trequattrini, Francesco; O., Palumbo; J. B., Brubach; P., Roy; Navarra, MARIA ASSUNTA; Panero, Stefania; A., Paolone. - In: JOURNAL OF PHYSICAL CHEMISTRY. A, MOLECULES, SPECTROSCOPY, KINETICS, ENVIRONMENT, & GENERAL THEORY. - ISSN 1089-5639. - STAMPA. - 118:(2014), pp. 8758-8764. [10.1021/jp504833e]

Stabilization of different conformers of bis(trifluoromethanesulfonyl)imide anion in ammonium-based ionic liquids at low temperatures

TREQUATTRINI, Francesco;NAVARRA, MARIA ASSUNTA;PANERO, Stefania;
2014

Abstract

The infrared absorption spectra of two ionic liquids with bis(trifluoromethanesulfonyl)-imide (TFSI) as an anion and ammonium with different alkyl chains as cations are reported as a function of temperature. Using the comparison with ab initio calculations of the infrared-active intramolecular vibrations, the experimental lines were ascribed to the various ions composing the ionic liquids. In the liquid state of the samples, both conformers of the TFSI ion are present. In the solid state, however, the two conformers survive in N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)imide (TMPA-TFSI), while only cis-TFSI is retained in N-trimethyl-N-hexylammonium bis(trifluoromethanesulfonyl)imide (TMHA-TFSI). We suggest that the longer alkyl chains of the former compound stabilize the less stable conformer of TFSI by means of stronger interactions between anions and cations.
2014
01 Pubblicazione su rivista::01a Articolo in rivista
Stabilization of different conformers of bis(trifluoromethanesulfonyl)imide anion in ammonium-based ionic liquids at low temperatures / F., Vitucci; Trequattrini, Francesco; O., Palumbo; J. B., Brubach; P., Roy; Navarra, MARIA ASSUNTA; Panero, Stefania; A., Paolone. - In: JOURNAL OF PHYSICAL CHEMISTRY. A, MOLECULES, SPECTROSCOPY, KINETICS, ENVIRONMENT, & GENERAL THEORY. - ISSN 1089-5639. - STAMPA. - 118:(2014), pp. 8758-8764. [10.1021/jp504833e]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/769994
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