On the self-aggregation and fluorescence quenching aptitude of surfactant ionic liquids

Marijana Blesic, António Lopes, Eurico Melo, Zeljko Petrovski, Natalia V. Plechkova, José N. Canongia Lopes, Kenneth R. Seddon, Luís Paulo N. Rebelo

Research output: Contribution to journalArticlepeer-review

147 Citations (Scopus)

Abstract

The aggregation behavior in aqueous solution of a number of ionic liquids was investigated at ambient conditions by using three techniques: fluorescence, interfacial tension, and 1H NMR spectroscopy. For the first time, the fluorescence quenching effect has been used for the determination of critical micelle concentrations. This study focuses on the following ionic liquids: [Cnmpy]Cl (1-alkyl-3-methylpyridinium chlorides) with different linear alkyl chain lengths (n = 4, 10, 12, 14, 16, or 18), [C 12mpip]Br (1-dodecyl-1-methylpiperidinium bromide), [C 12mpy]Br (1-dodecyl-3-methylpyridinium bromide), and [C 12mpyrr]Br (1-dodecyl-1-methylpyr-rolidinium bromide). Both the influence of the alkyl side-chain length and the type of ring in the cation (head) on the CMC were investigated. A comparison of the self-aggregation behavior of ionic liquids based on 1-alkyl-3-methylpyridinium and 1-alkyl-3-methylpyridinium cations is provided. It was observed that 1-alkyl-3-methylpyridinium ionic liquids could be used as quenchers for some fluorescence probes (fluorophores). As a consequence, a simple and convenient method to probe early evidence of aggregate formation was established.

Original languageEnglish
Pages (from-to)8645-8650
Number of pages6
JournalJournal of Physical Chemistry B
Volume112
Issue number29
DOIs
Publication statusPublished - 24 Jul 2008

Keywords

  • Ionic liquids
  • Micelles
  • Active ionic

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