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  • Title: Synthesis of biindole-diazo conjugates as a colorimetric anion receptor.
    Author: Lee GW, Kim NK, Jeong KS.
    Journal: Org Lett; 2010 Jun 04; 12(11):2634-7. PubMed ID: 20446657.
    Abstract:
    A colorimetric anion receptor based on an indole scaffold has been synthesized by incorporating an azobenzene chromophore to the 5-position of indole. The receptor binds anions by hydrogen bonds which are effectively transmitted through resonance to the chromophore to give rise to color changes. The cyanide ion induced a pronounced color change from light yellow to reddish orange, but less intense or negligible changes were observed with the other anions examined here.
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