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Photoformation of ( Z )‐Isomers in Diarylazomethines. Part IV . Direct and sensitized photoisomerization of pyridyl analogues of benzylidene‐aniline and absorption spectra of their ( Z )‐isomers
Author(s) -
Maeda Koko,
Fischer Ernst
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.19830660707
Subject(s) - chemistry , photoisomerization , isomerization , aniline , photochemistry , absorption spectroscopy , absorption (acoustics) , spectral line , cis–trans isomerism , irradiation , stereochemistry , organic chemistry , catalysis , physics , quantum mechanics , astronomy , acoustics , nuclear physics
UV irradiation of solutions of the (E) ‐isomers of five (out of the possible six) monopyridyl analogues at reduced temperatures results in extensive (80–90%) conversion into the corresponding (Z) ‐isomers. The process is reversible both thermally and photochemically. The (Z) ‐isomers are stable at temperatures below −80°, and their absorption spectra were estimated. Biacetyl‐photosensitized ( E )( Z ) isomerization was observed, with ( Z )‐contents of ca. 70% at the photo‐stationary state.