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Photochromisme des spiropyrannes. Photodégradation d'aza‐, oxaza‐ et thiaza‐cyclopentane‐ et ‐cyclohexanespiropyrannes
Author(s) -
Gaude Didier,
Gautron René,
Maguet Michel,
Guglielmetti Robert
Publication year - 1983
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19830660130
Subject(s) - chemistry , photodegradation , photochemistry , cyclopentane , photodissociation , photochromism , organic chemistry , catalysis , photocatalysis
Photochromism of spiropyrans. Photodegradation of aza‐, oxaza‐, and thiaza‐cyclopentane‐ and ‐cyclohexanespiropyrans Study of the photodegradation of saturated azaheterocyclic spiropyrans showed that electron‐donor substituents improve, as in the benzoheterocyclic series, the fatigue properties towards. UV. light. The introduction of oxygen or sulfur in the 5‐ or 6‐membered saturated azacycles or the substitution with an orthofused aromatic nucleus have practically no influence on the results of photodegradation. The indolinospiropyrans allow the greatest number of photochromic cycles before falling to half the initial absorbance on photolysis under accurate conditions.