2016/04/25 by Prabodh Dhakal, Dhakal, Prabodh, Mark G. Kuzyk +1 · 1 citation
Chemistry · Materials Science · #Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Free Radicals and Antioxidants #Optics (physics.optics) #Photochemistry and Electron Transfer Studies #Photochromic and Fluorescence Chemistry
paper · pdf · doi:10.48550/arxiv.1604.07645
openalex publication_date 2016/04/25 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28
Reversible photodegradation is a process that has been observed in several\ndye molecules, but the underlying mechanisms are not still well understood. In\nthis contribution, we characterize a series of anthraquinone dyes to determine\nhow self-healing depends on molecular structure. Past studies have used probing\ntechniques that rely on linear absorption, two-photon fluorescence, and\namplified spontaneous emission. Each of these probes provide an indirect\nmeasure of the populations of the damaged and undamaged species, requiring\ncalibrations or assumptions to be made that might affect the accuracy of the\nresults. The present studies use fluorescence as a probe, which is shown to\ndirectly measure the undamaged population. It is found that certain\nanthraquinone classes share common structural features that are associated with\nself healing. Furthermore, the time and temperature dependence of\nphotodegradation and self-healing is found to be consistent with the domain\nmodel of self healing.\n