Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
177769 | Dyes and Pigments | 2009 | 11 Pages |
Abstract
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.
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Raquel Gomes, Ana M. Diniz, Alexandre Jesus, A. Jorge Parola, Fernando Pina,