title: Fluorescence correlation spectroscopic studies of diffusion within the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate.
abstract: Fluorescence correlation spectroscopy (FCS) measurements have been performed in order to determine the translational diffusion coefficients of three differently charged fluorescent probes (cationic: rhodamine 6G, neutral: 4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4-H-pyran, DCM, and anionic: fluorescein) dissolved within the common room temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6]. These experiments demonstrate that FCS is a rapid, sensitive, precise (typical RSD from 4-8%), and low-consumption screening tool for the determination of analyte mobility within microliter ionic liquid samples.
authors.affiliation: Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: James H
authors.initials: JH
authors.lastname: Werner
authors.forename: Sheila N
authors.initials: SN
authors.lastname: Baker
authors.forename: Gary A
authors.initials: GA
authors.lastname: Baker