TIME-RESOLVED EMISSION STUDY OF INTRAMOLECULAR EXCIMERS IN 1,3-BIS (N-CARBAZOLYL) PROPANE: SOLVENT VISCOSITY EFFECTS
Loading...
Date
1975
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The kinetics for formation and dissociation of intramolecular excimers in 1,3-bis(N-carbazolyl)propane have been studied in a large number of solvents using time-resolved fluorescence techniques. The rate constants for both formation and dissociation of the intramolecular excimer are seen to decrease with increasing solvent viscosity ($\eta$) as expected for a process requiring an intramolecular rearrangement. No strict functional dependence on viscosity is observed however unless the studies are confined to homologous series of solvents. In a series of alkanes both rate constants are proportional to $\eta^{-0.34}$ and in alcohols to $\eta^{-0.51}$. This anomalous Stokes-Einstein behavior is discussed in terms of the microstructure of the surrounding solvent. Solvent systems of high macroscopic viscosity, formed by the addition of polystyrene, do not effect the kinetics.
Description
Author Institution: Xerox Corporation, Webster Research Center