Premium
PHOTOINDUCED LUMINESCENCE AND EPR SIGNALS OF POLYPHENOL AND QUINONE POLYMERS
Author(s) -
Slawinska D.,
Slawinski J.,
Sarna T.
Publication year - 1975
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1975.tb06694.x
Subject(s) - luminescence , electron paramagnetic resonance , photochemistry , quinone , polymer , polyphenol , chemistry , optoelectronics , materials science , organic chemistry , nuclear magnetic resonance , antioxidant , physics
— Aqueous basic solutions, pH 9.0 of humic acids and melanin‐like, synthetic polymers, obtained with adrenochrome, hydroquinone and purpurogallin, were illuminated with visible light under N 2 or O 2 atmospheres. It has been found that light enhances a singlet electron‐paramagnetic‐resonance (EPR) signal of polymers both under N 2 and O 2 , and induces ultra‐weak luminescence in the presence of O 2 . Degradative oxidation of polymers, accelerated by light, leads to a decrease of EPR signal intensity and generates weak chemiluminescence.