Abstract
Novel spiro[thioxanthene-naphthopyrans] were prepared and their photochromic properties in solution investigated under UV-Vis continuous irradiation. When compared to known similar naphthopyrans these new compounds showed a significant bathochromic shift of the maximum wavelength of absorption and faster ring closure kinetics.
Keywords: Photochromism, naphthopyran, spiro compounds, kinetics, UV irradiation, heterocycles
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