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Synthesis and photochromism of a novel selenazolyl fulgide

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image of Research on Chemical Intermediates

Novel fulgides, 5-selenazolyl fulgides, were synthesized and E and Z isomers were directly separated by column chromatography. E↔Z photo-isomerization was only observed during conventional UV light irradiation. Using the pulse laser-photolysis method, photochromic processes were studied. Both the excited singlet state and excited triplet state contribute to photo-cyclization reaction to form the colored form (closed form). The closed form is unstable and quickly goes back to the open form. Solvent has remarkable effect on absorption spectra of the closed form.


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