Photochemistry of Anthrylethene Derivatives Containing Heteroaromatic Ring:Pyrrole and Indole Derivatives

摘要

Diarylethenes are generally known to perform reversible photochemical cis-trans isomerization.However,l-(9-anthryl)-2-phenylethene(9-APE) executes efficient cis-> trans photoisomerization but do not undergo reverse trans-> cis photoisomerization.The excitation energy is extensively localized in the large anthracene moiety so that the transoid geometry corresponds to energy minima in the excited potential energy surface.The energy barrier to C=C bond twisting is too high for t-9-APE to undergo trans -> cis photoisomerization.