Abstract
1,2,3‐Triazabutadienes. VII. Investigation of the Mechanism of the Photochemical cis‐trans‐Isomerization of 1‐Aryl‐3‐[3‐methyl‐benzthiazolinyliden‐(2)]‐triazenesThe direct photoisomerizations of substituted triazabutadienes are investigated. The quantum yields do not considerably depend on substituents in the phenyl‐group of triazabutadienes, on the wavelength of irradiation light and on the solvent. The quantum yields of the cis→trans‐transformation are always higher than the quantum yields of the back reaction. The sums of quantum yields approximate 1. At low temperatures the quantum yields of photoisomerization become smaller in a significant way. With flash photolysis it is not possible to prove triplet state of triazabutadienes. Triplet quenchers have no influence on photoisomerization. The mechanism of the photochemical cis‐trans‐isomerization of triazabutadienes is discussed.
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