Dispersed kinetics without rate heterogeneity in an ionic liquid measured with multiple population-period transient spectroscopy
Author(s)
Khurmi, Champak
Berg, Mark
Griffith University Author(s)
Year published
2010
Metadata
Show full item recordAbstract
The kinetics of the electronic-state relaxation of the diphenylmethane dye auramine O are found to be much more dispersed (nonexponential) in a prototypical ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, than in ordinary solvents. Recent theoretical and experimental evidence for structural heterogeneity in ionic liquids suggest that the dispersion is due to rate heterogeneity, that is, different relaxation rates for solute molecules in different spatial regions. This hypothesis is tested with a new multidimensional spectroscopy, MUPPETS (multiple population-period transient spectroscopy). Rate heterogeneity ...
View more >The kinetics of the electronic-state relaxation of the diphenylmethane dye auramine O are found to be much more dispersed (nonexponential) in a prototypical ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, than in ordinary solvents. Recent theoretical and experimental evidence for structural heterogeneity in ionic liquids suggest that the dispersion is due to rate heterogeneity, that is, different relaxation rates for solute molecules in different spatial regions. This hypothesis is tested with a new multidimensional spectroscopy, MUPPETS (multiple population-period transient spectroscopy). Rate heterogeneity is not found to be the primary cause of the dispersed kinetics. Rather, a homogeneous mechanism is responsible for this unusual phenomenon.
View less >
View more >The kinetics of the electronic-state relaxation of the diphenylmethane dye auramine O are found to be much more dispersed (nonexponential) in a prototypical ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate, than in ordinary solvents. Recent theoretical and experimental evidence for structural heterogeneity in ionic liquids suggest that the dispersion is due to rate heterogeneity, that is, different relaxation rates for solute molecules in different spatial regions. This hypothesis is tested with a new multidimensional spectroscopy, MUPPETS (multiple population-period transient spectroscopy). Rate heterogeneity is not found to be the primary cause of the dispersed kinetics. Rather, a homogeneous mechanism is responsible for this unusual phenomenon.
View less >
Journal Title
Journal of Physical Chemistry Letters
Volume
1
Issue
1
Copyright Statement
Self-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the authors for more information.
Subject
Physical Sciences not elsewhere classified
Physical Sciences
Chemical Sciences