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A family of bi-heterocyclic dyes have been first synthesized by using heterocyclic pyridone and benzothiazole components. UV−Vis spectral analyses reveal distinct spectral behaviors depending on the introduced electron-withdrawing and electron-donating groups in the benzothiazol ring as well as the polarity of solvents. Namely, nitrobenzothiazol based bi-heterocyclic dyes display more obvious solvatochromism...
A series of bi-heterocyclic hydrazone dyes have been synthesized by classic diazotization reactions between 2-amino-3-cyano-4-chloro-5-formylthiophene and five pyridine-2,6-dione based coupling components, including two acetal products undergoing dimethylacetalization of aldehyde group in the presence of methanol and glacial acetic acid. 1H NMR spectral and single-crystal X–ray diffraction studies...
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