title: Synthesis of biindole-diazo conjugates as a colorimetric anion receptor.
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.
authors.affiliation: Center of Bioactive Molecular Hybrids and Department of Chemistry, Yonsei University, Seoul 120-749, Korea.
authors.forename: Gang Woo
authors.initials: GW
authors.lastname: Lee
authors.forename: Nam-Kyun
authors.initials: NK
authors.lastname: Kim
authors.forename: Kyu-Sung
authors.initials: KS
authors.lastname: Jeong
mesh_terms: D000838:Anions / Q000737:chemistry; D001391:Azo Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D003124:Colorimetry; D007211:Indoles / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure
chemical_list: D000838:Anions; D001391:Azo Compounds; D007211:Indoles