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Evidence of adiabatic channels in the singlet photoisomerization of cis-1,2-diarylethenes: a fluorimetric study

✍ Scribed by Ugo Mazzucato; Anna Spalletti; Giampiero Bartocci; Guido Galiazzo

Book ID: 113138586
Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 687 KB
Volume: 125
Category: Article
ISSN: 0010-8545
DOI: 10.1016/0010-8545(93)85022-v

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## Abstract The __cis__ and __trans__ isomers of eight 1,2‐diarylethylenes, precursors of helicenes, have been studied by NMR. spectroscopy. The observed differences in chemical shifts, specific solvent effects and steric effects (bromo derivatives) can be explained by the contribution of ‘helicene