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

Marijana Blesic, A. Lopes, E. Melo, Z. Petrovski, Natalia Plechkova, J.N.C. Lopes, Kenneth Seddon, L.P.N. Rebelo

Research output: Contribution to journalArticle

144 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 H-1 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: [C(n)mpy]Cl (1-alkyl-3-methylpyridinium chlorides) with different linear alkyl chain lengths (n = 4, 10, 12, 14, 16, or 18), [C(12)mpip]Br (1-dodecyl-1-methylpiperidinium bromide), [C(12)mpy]Br (1-dodecyl-3-methylpyridinium bromide), and [C(12)mpyrr]Br (1-dodecyl-1-methylpyrrolidinium 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
Early online date01 Jul 2008
DOIs
Publication statusPublished - 24 Jul 2008

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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