Quantitative evaluation of soluble polymeric photosensitizers, 4. Trans ‐ cis isomerization of stilbene photosensitized by polymerbound o ‐ and p ‐benzyloxybenzaldehyde
1987; Wiley; Volume: 188; Issue: 7 Linguagem: Inglês
10.1002/macp.1987.021880717
ISSN0025-116X
AutoresR. MARTINEZ‐UTRILLA, F. Catalina, R. Sastre,
Tópico(s)Photopolymerization techniques and applications
ResumoAbstract The grafting of o ‐ and p ‐benzyloxybenzaldehyde onto linear chloromethylated polystyrene is described. The resulting soluble polymeric photosensitizers and their model compounds, o ‐ and p ‐( p ‐isopropylbenzyloxy)benzaldehyde, were tested as triplet energy donors against trans ‐stilbene in benzene solution. Irradiation of the ortho ‐compounds gives rise to a transformation which has been tentatively attributed to an intramolecular photocyclization. Stern‐Volmer constants for the photostable para ‐compounds were determined. Results for both types of compounds show that the sensitizer efficiency diminishes when it is bound to the polymer.
Referência(s)