Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • The Thirteenth International Conference on Ultrafast Phenomena
  • 2002 OSA Technical Digest Series (Optica Publishing Group, 2002),
  • paper WD16
  • https://doi.org/10.1364/UP.2002.WD16

Femtosecond fluorescence studies of two-dimensional dynamics of bridged and unbridged Michler’s ketones

Not Accessible

Your library or personal account may give you access

Abstract

For di- and triphenylmethane dye molecules in liquid solution it is well-known that the fluorescence quantum yield varies drastically with the viscosity of the solvent. Torsional motions of the phenyl rings of the dye molecules are believed to control the fluorescence quantum yield, i.e., if the solvent viscosity permits phenyl-group twisting the fluorescence is weakened. However, recent theoretical studies of photoexcited TICT states in liquid solution, have emphasized the importance of a two-dimensional reaction coordinate approach [1]. In the latter, the dynamics in the excited state is determined not only by the reaction coordinate (e.g., twisting), but also by the solvation coordinate. In this paper, we present results of femtosecond fluorescence upconversion experiments of two diphenyl methane dyes (Figure 1), Michler’s ketone (MK) and its bridged analog 3,6-bis(dimethylamino)-10,10-dimethylanthrone (BMK). For the unbridged MK in alcoholic solution very fast fluorescence decay kinetics of only a few picoseconds is reported, whereas its bridged counterpart BMK has a lifetime at least one order of magnitude longer. The molecules are identified as prototype examples of the slow and fast solvation limits in the model of Kim and Hynes.

© 2002 Optical Society of America

PDF Article
More Like This
Subpicosecond Study of the Dynamic Processes in Push-Pull Styrenes and the Role of Solvation

P. Hébert, G. Baldacchino, T. Gustavsson, V. Kabelka, P. Baldeck, and J.-C. Mialocq
FC10 International Conference on Ultrafast Phenomena (UP) 1992

(Sub)picosecond Time-Resolved Fluorescence Depolarization of OLED Compounds Alq3, Gaq3, and Inq3

E. van Veldhoven, H. Zhang, and M. Glasbeek
TuF25 International Conference on Ultrafast Phenomena (UP) 2000

Femtosecond Solvent Dynamics Studied by Time Resolved Fluorescence and Transient Birefringence.

S. J. Rosenthal, N. F. Scherer, M. Cho, X. Xie, M. E. Schmidt, and G. R. Fleming
FC13 International Conference on Ultrafast Phenomena (UP) 1992

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved