Linear and Angular Distyrylpyrazines with Terminal Donor Groups: Synthesis, Solvatochromism, and Acidochromism of the Electronic Spectra

<table>Acidochromism of absorption and fluorescence of linear bis(3,4- dimethoxystyryl)pyrazine <b>4</b> in the presence of TFA.</table>

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Figure 2: Linear and Angular Distyrylpyrazines with Terminal Donor Groups: Synthesis, Solvatochromism, and Acidochromism of the Electronic Spectra 