The synthesis and reaction network of 2-styryl-1-benzopyrylium salts: An unexploited class of potential colorants

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The syntheses, thermodynamic and kinetic properties of a series of 2-styryl-1-benzopyrylium compounds are reported. This family of compounds was found to follow the same pH- and light-dependent network of chemical reactions previously described for flavylium (2-phenyl-1-benzopyrylim) compounds. However, 2-styryl-1-benzopyrylium compounds exhibit absorption spectra substantially red shifted when compared with flavylium analogues (up to 90 nm). In particular, a photochromic system switching from yellow to light blue based on derivatives of natural anthocyanins is for the first time documented. (C) 2008 Elsevier Ltd. All rights reserved.
Original languageUnknown
Pages (from-to)69-79
JournalDyes and Pigments
Issue number1
Publication statusPublished - 1 Jan 2009

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