10.1021/acs.jpca.6b02127.s001
Björn Kobin
Björn
Kobin
Sandra Behren
Sandra
Behren
Beatrice Braun-Cula
Beatrice
Braun-Cula
Stefan Hecht
Stefan
Hecht
Photochemical Degradation of Various Bridge-Substituted
Fluorene-Based Materials
American Chemical Society
2016
polyfluorene materials
measurements show
Photochemical Degradation
quantum
kinetic
LC
method
model compounds
UV
bridge substituents
degradation mechanisms
2016-07-13 07:09:18
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Photochemical_Degradation_of_Various_Bridge-Substituted_Fluorene-Based_Materials/3484142
Photochemical degradation is an important
issue to be overcome
in advancing the lifetime of fluorene-containing conjugated polymers.
In order to optimize the inertness of the materials, a quantitative
measure for the efficiency of degradation is needed. Here, we introduce
a method to measure a relative quantum yield of the photochemical
degradation by monitoring the kinetics of the process by means of
UV/vis spectroscopy and liquid chromatography (LC) techniques. This
method is employed to a set of differently substituted 2,7-diphenylfluorenes,
serving as model compounds for polyfluorene materials. Our measurements
show that the quantum yield changes by orders of magnitude upon varying
the bridge substituents and that altered kinetics indicate changing
degradation mechanisms.