Abstract
A number of new photochromic 3-(4-phenylthiazol-5-yl)-and 3-(4-hetarylthiazol-5-yl)- coumarins has been synthesized. These compounds possess properties of molecular photo- switches providing a reversible change of the fluorescence intensity in the visible region of the spectrum upon alternating irradiation of their solutions with the visible and UV light. Irradiation with the UV light (λ < 400 nm) leads to their electrocyclization and loss of fluorescence, whereas irradiation of the cyclic form with the visible light (λ < 400 nm) returns the system to the state with the original absorption and fluorescence spectra. Switching of fluorescence is also observed in polymer matrices.
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Dedicated to Academician A. I. Konovalov on his 75th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 162–169, January, 2009.
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Bochkov, A.Y., Yarovenko, V.N., Barachevskii, V.A. et al. Coumarinyl(thienyl)thiazoles as new fluorescent molecular photoswitches. Russ Chem Bull 58, 162–169 (2009). https://doi.org/10.1007/s11172-009-0025-3
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DOI: https://doi.org/10.1007/s11172-009-0025-3