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

被引：161

作者：

Blesic, Marijana ^{[1
,2
]}

Lopes, Antonio ^{[1
]}

Melo, Enrico ^{[1
]}

Petrovski, Zejko ^{[3
]}

Plechkova, Natalia V. ^{[2
]}

Canongia Lopes, Jose N. ^{[1
,4
]}

Seddon, Kenneth R. ^{[1
,2
]}

Rebelo, Luis Paulo N. ^{[1
]}

机构：

[1] Univ Nova Lisboa, Inst Tecnol Quim & Biol, ITQB 2, P-2780901 Oeiras, Portugal

[2] Queens Univ Belfast, QUILL Ctr, Belfast BT9 5AG, Antrim, North Ireland

[3] Inst Super Tecn, CQFM, Dept Engn Quim & Biol, P-1049001 Lisbon, Portugal

[4] Inst Super Tecn, CQFM, Ctr Quim Estrutural, P-1049001 Lisbon, Portugal

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 29期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1021/jp802179j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：8645 / 8650

页数：6

共 35 条

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