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The role of the cation aliphatic side chain length in piperidinium bis(trifluoromethansulfonyl)imide ionic liquids

TitoloThe role of the cation aliphatic side chain length in piperidinium bis(trifluoromethansulfonyl)imide ionic liquids
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2011
AutoriMontanino, M., Carewska M., Alessandrini F., Passerini S., and Appetecchi Giovanni Battista
RivistaElectrochimica Acta
Volume57
Paginazione153-159
ISSN00134686
Parole chiaveAliphatic chains, Aliphatic side chain, Alkyl chain lengths, Cation ring, Chain length, Electric properties, Electrochemical stabilities, Electrochemical stability, Ionic liquids, Long aliphatic chain, N-Alkyl-N-alkylpiperidinium, Nano scale, nanotechnology, Positive ions, Side-chains, Structural heterogeneity, Thermodynamic stability, Viscosity, Wide-angle X-ray scattering
Abstract

This paper reports on the dependence of physical-chemical and electrical properties of ionic liquids formed by N-alkyl-N-alkylpiperidinum cations and bis(trifluoromethane-sulfonyl)imide anions with respect to the length of the cation aliphatic side chain. The thermal stability as well as the density and conductivity were seen to decrease with the alkyl chain length, independently on the cation ring. The ionic conduction, in agreement with the DSC results, is correlated with the viscosity that is found to increase with the main aliphatic chain length. The alkyl chain length influences the cathodic electrochemical stability whereas no relevant difference was detected in the anodic stability. The evolution of the melting point, density and viscosity, detected for the cation having the hexyl side chain, points towards some nanoscale separation, e.g., a segregation of the long aliphatic chains into nanoscale apolar domains that are embedded into three-dimensional charged matrices generated by the anions and the charged piperidinium heads. The existence of such structural heterogeneities, predicted also by other authors, was proposed on the basis of previous Wide Angle X-ray Scattering (WAXS) measurements. © 2011 Elsevier Ltd. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-80055021210&doi=10.1016%2fj.electacta.2011.03.089&partnerID=40&md5=92a4b5bea4e8b27e29b4b7c7b5beb0da
DOI10.1016/j.electacta.2011.03.089
Citation KeyMontanino2011153