Abstract The solvatochromism of nine push–pull substituted catechol derivatives has been studied in a set of 39 various solvents. The influence of successive methyl substitution at the catechol OH groups on the extent of the solvatochromic shift has been investigated. The positive solvatochromism of 2-(3, 4-dihydroxybenzylidene)-2H-indene-1, 3-dione amounts 4360 cm–1, which ranges from toluene to hexamethyl-phosphoric triamide. To the best of ...
![2-[(3,4-dimethoxyphenyl)methylidene]indene-1,3-dione Structure](https://image.chemsrc.com/caspic/283/58161-74-3.png)
