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Like a color palette: A naphthalenediimide-based organogel colorimetric sensor allows recognition of the positional isomers of dihydroxynaphthalene in the gel phase with the naked eye. Intercalation of the dihydroxynaphthalene into the gel matrix produces a donor–acceptor interaction, which gives the gel a distinct color that depends on the strength of noncovalent (H-bonding, π-stacking, van der Waals) interactions. Supporting information for this article is available on the WWW under http: //www. wiley-vch. de/contents/jc₂002/2006/z503158ₛ. 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.
Mukhopadhyay et al. (Fri,) studied this question.