en
Scientific article
English

Spurious Observation of the Marcus Inverted Region in Bimolecular Photoinduced Electron Transfer

Published inJournal of the American Chemical Society, vol. 134, no. 28, p. 11396-11399
Publication date2012
Abstract

The effect of viscosity on the bimolecular electron transfer quenching of a series of coumarins by N,N-dimethylaniline was investigated using steady-state and time-resolved fluorescence spectroscopy. The data reveal that the static and transient stages of the quenching become dominant as viscosity increases. When extracting the quenching rate constants using a simple Stern–Volmer analysis, a decrease of the rate constant with increasing driving force is observed above ~2 cP. However, this apparent Marcus inverted region, already reported several times with the same system in micelles and room temperature ionic liquids, totally vanishes when analyzing the data with a model accounting for the static and transient stages of the quenching. It appears that the apparent Marcus inverted region arises from the neglect of these quenching regimes together with the use of fluorophores with different excited-state lifetimes.

Research group
Citation (ISO format)
ROSSPEINTNER, Arnulf et al. Spurious Observation of the Marcus Inverted Region in Bimolecular Photoinduced Electron Transfer. In: Journal of the American Chemical Society, 2012, vol. 134, n° 28, p. 11396–11399. doi: 10.1021/ja3049095
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
ISSN of the journal1520-5126
596views
0downloads

Technical informations

Creation07/18/2012 3:45:00 PM
First validation07/18/2012 3:45:00 PM
Update time03/14/2023 5:38:40 PM
Status update03/14/2023 5:38:40 PM
Last indexation05/02/2024 12:35:19 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack