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Electronic States of Phenylene and Naphthylene Bicyclobutanes. Linear Dichroism in Stretched Polyethylene

✍ Scribed by Jens Spanget-Larsen; Klaus Gubernator; Rolf Gleiter; Erik W. Thulstrup; Bernard Bianco; Gérard Gandillon; Ulrich Burger

Publisher
John Wiley and Sons
Year
1983
Tongue
German
Weight
560 KB
Volume
66
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Excited singlet states of bicyclobutylene‐benzene (2), 1,2:4,5‐bis (bicyclo‐butylene)benzene (3), 2,3‐bicyclobutylene‐naphthalene (4), and 1,8‐bicyclobutylene‐naphthalene (5) are investigated by means of linear dichroic absorption spectroscopy of molecules oriented in stretched polyethylene films and by semiempirical model calculations. The results indicate a strong hyperconjugative impact of the bicyclobutylene group on the aromatic chromophores in these compounds. Valence isomerization to aromatic products is predicted as the preferred photochemical pathway.

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