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Molecular structure and reversible photodegradation in anthraquinone dyes

Paper ID Volume ID Publish Year Pages File Format Full-Text
25920 43920 2016 11 PDF Available
Title
Molecular structure and reversible photodegradation in anthraquinone dyes
Abstract

Reversible photodegradation is a process that has been observed in several dye molecules, but the underlying mechanisms are not still well understood. In this contribution, we characterize a series of anthraquinone dyes to determine how self-healing depends on molecular structure. Past studies have used probing techniques that rely on linear absorption, two-photon fluorescence, and amplified spontaneous emission. Each of these probes provide an indirect measure of the populations of the damaged and undamaged species, requiring calibrations or assumptions to be made that might affect the accuracy of the results. The present studies use fluorescence as a probe, which is shown to directly measure the undamaged population. It is found that certain anthraquinone classes share common structural features that are associated with self healing. Furthermore, the time and temperature dependence of photodegradation and self-healing is found to be consistent with the domain model of self healing.

Keywords
Photodegradation; Self-healing; Anthraquinone dyes; Polymer; Absorption and fluorescence spectroscopy; Damaged and undamaged population; Isosbestic point; Domain model
First Page Preview
Molecular structure and reversible photodegradation in anthraquinone dyes
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 328, 1 September 2016, Pages 66–76
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering