Solvent Effect on Color, Band Shape, and Charge‐Density Distribution for Merocyanine Dyes Close to the Cyanine Limit

Solvatochromism elucidated: UV/Vis and electrooptical absorption spectroscopy were used to elucidate the effect of solvent on the electrical and optical properties of three merocyanine dyes. Changes in the shape of the Vis absorption band in solvents of different polarity e. g. , the depicted dye in Et2O (black), AcOEt (blue), and MeCN (orange) are explained by different excited-state dipole moments of the respective vibronic transitions. Supporting information for this article is available on the WWW under http: //www. wiley-vch. de/contents/jc₂002/2008/z800279ₛ. pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.