Issue 27, 2011

Fluorescence correlation spectroscopy evidence for structural heterogeneity in ionic liquids

Abstract

In this work, we provide new experimental evidence for chain length-dependent self-aggregation in room temperature ionic liquids (RTILs) using fluorescence correlation spectroscopy (FCS). In studying a homologous series of N-alkyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide, [CnMPy][Tf2N] RTILs of varying alkyl chain length (n = 3, 4, 6, 8, and 10), biphasic rhodamine 6G solute diffusion dynamics were observed; both the fast and slow diffusion coefficients decreased with increasing alkyl chain length, with the relative contribution from slower diffusion increasing for longer-chain [CnMPy][Tf2N]. We propose that the biphasic diffusion dynamics originate from self-aggregation of the nonpolar alkyl chains in the cationic [CnMPy]+.

Graphical abstract: Fluorescence correlation spectroscopy evidence for structural heterogeneity in ionic liquids

Supplementary files

Article information

Article type
Communication
Submitted
25 Mar 2011
Accepted
03 May 2011
First published
09 Jun 2011

Phys. Chem. Chem. Phys., 2011,13, 12395-12398

Fluorescence correlation spectroscopy evidence for structural heterogeneity in ionic liquids

J. Guo, G. A. Baker, P. C. Hillesheim, S. Dai, R. W. Shaw and S. M. Mahurin, Phys. Chem. Chem. Phys., 2011, 13, 12395 DOI: 10.1039/C1CP20929A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements