TY - JOUR
T1 - On the self-aggregation and fluorescence quenching aptitude of surfactant ionic liquids
AU - Blesic, Marijana
AU - Lopes, António
AU - Melo, Eurico
AU - Petrovski, Zeljko
AU - Plechkova, Natalia V.
AU - Canongia Lopes, José N.
AU - Seddon, Kenneth R.
AU - Rebelo, Luís Paulo N.
N1 - Engineering and Physical Sciences Research Council (EP/D029538/1)
PY - 2008/7/24
Y1 - 2008/7/24
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 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.
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 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.
KW - Ionic liquids
KW - Micelles
KW - Active ionic
UR - http://www.scopus.com/inward/record.url?scp=49149086566&partnerID=8YFLogxK
U2 - 10.1021/jp802179j
DO - 10.1021/jp802179j
M3 - Article
C2 - 18590308
AN - SCOPUS:49149086566
SN - 1520-6106
VL - 112
SP - 8645
EP - 8650
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 29
ER -