Abstract
The deactivation of the first excited singlet state (S 1) of some cis isomers of 1,2-diarylethenes was studied by fluorimetric and photochemical measurements. When at least one of the aryl groups is a large polycyclic group of low S 1 energy (as in the case of pyrenyl and anthryl derivatives) the minimum at 90° (typical of stilbene) in the potential energy curve as a function of the twisting coordinate may disappear. This leads to an unusual fluorescence emission at room temperature and favours the adiabatic 1cis * → 1trans * isomerization mechanism instead of the well-known diabatic pathway, which implies internal conversion to the ground state from the 1perp * configuration.
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