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

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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

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aptitude
Ionic Liquids
Ionic liquids
Surface-Active Agents
Quenching
Surface active agents
Agglomeration
Fluorescence
quenching
surfactants
bromides
fluorescence
liquids
Bromides
Chain length
Cations
Positive ions
cations
Fluorophores
Critical micelle concentration

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Blesic, M., Lopes, A., Melo, E., Petrovski, Z., Plechkova, N., Lopes, J. N. C., ... Rebelo, L. P. N. (2008). On the self-aggregation and fluorescence quenching aptitude of surfactant ionic liquids. Journal of Physical Chemistry B, 112(29), 8645-8650. https://doi.org/10.1021/jp802179j
Blesic, Marijana ; Lopes, A. ; Melo, E. ; Petrovski, Z. ; Plechkova, Natalia ; Lopes, J.N.C. ; Seddon, Kenneth ; Rebelo, L.P.N. / On the self-aggregation and fluorescence quenching aptitude of surfactant ionic liquids. In: Journal of Physical Chemistry B. 2008 ; Vol. 112, No. 29. pp. 8645-8650.
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Blesic, M, Lopes, A, Melo, E, Petrovski, Z, Plechkova, N, Lopes, JNC, Seddon, K & Rebelo, LPN 2008, 'On the self-aggregation and fluorescence quenching aptitude of surfactant ionic liquids', Journal of Physical Chemistry B, vol. 112, no. 29, pp. 8645-8650. https://doi.org/10.1021/jp802179j

On the self-aggregation and fluorescence quenching aptitude of surfactant ionic liquids. / Blesic, Marijana; Lopes, A.; Melo, E.; Petrovski, Z.; Plechkova, Natalia; Lopes, J.N.C.; Seddon, Kenneth; Rebelo, L.P.N.

In: Journal of Physical Chemistry B, Vol. 112, No. 29, 24.07.2008, p. 8645-8650.

Research output: Contribution to journalArticle

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T1 - On the self-aggregation and fluorescence quenching aptitude of surfactant ionic liquids

AU - Blesic, Marijana

AU - Lopes, A.

AU - Melo, E.

AU - Petrovski, Z.

AU - Plechkova, Natalia

AU - Lopes, J.N.C.

AU - Seddon, Kenneth

AU - Rebelo, L.P.N.

PY - 2008/7/24

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N2 - 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.

AB - 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.

U2 - 10.1021/jp802179j

DO - 10.1021/jp802179j

M3 - Article

VL - 112

SP - 8645

EP - 8650

JO - J. Phys. Chem. B

JF - J. Phys. Chem. B

SN - 1520-6106

IS - 29

ER -