Photoinduced phenoxyl radical formation from ligno-p-cresol as studied by steady-state and time-resolved EPR spectroscopy

Solid State Photochemistry of Hydroxylated Naphthalenes on Minerals: Probing Polycyclic Aromatic Hydrocarbon Transformation Pathways under Astrochemically-Relevant Conditions

“…From this set of experiments, it could be concluded that (a) forsterite has a significant catalytic effect on UV-induced degradation, suggesting a specific role in favoring evolution of excited states possibly via interaction with reactive OH groups through its basic sites, in agreement with previous studies; (b) with all HNs examined, extensive loss of OH stretching bands in the 3600–3000 cm –1 region is observed, denoting significant modification of the photolabile phenolic groups; , (c) irradiation of 1,8-DHN at room temperature induces specific photodegradation pathways absent in the case of 1-HN and 1,6-DHN, suggesting on one side formation of polymeric species (spectral changes above 4000 cm –1 ) and the other side the generation of species with distinct well-defined spectral features (see bands at 1666, 1517, 1456, and 1363 cm –1 ). Formation of CO 2 detected at 80 K suggests moreover profound photodestruction of 1,8-DHN via intermediate carboxyl formation followed by decarboxylation.…”

Application of phenolic radicals for antioxidants, as active materials in batteries, magnetic materials and ligands for metal-complexes

“…These polymers have been created by UVphotolysis of lignin-polymers. 54 Additionally conjugated polymers, like polythiophene 50 and poly(isonaphthene methine), 47 bearing phenoxyl-moieties have also gained interest due to their low band-gap value, 47 high spin-concentration and magnetic properties. 50 Styrene-based polymers containing phenoxylgroups have also been successfully synthesized and evaluated for their magnetic properties.…”