Abstract
AbstractOlefins with a phenathroline ring and a pyrrole ring were prepared and hydrogen atom transfer reaction in the excited singlet state was observed. The tautomer produced in the excited singlet state has lifetime of 30–50 ps for cis‐1 and c,t‐2 and with fluorescence maximum at longer wavelength region at 640 nm. The compound 1 exhibited photochromic behavior with its absorption maximum changing between 380 nm and 440 nm, while 2 exhibited only the small change of the absorption spectra on photoirradiation. Copyright © 2007 John Wiley & Sons, Ltd.
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