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SYNTHESIS and SPECTRA OF TRICYANOVINYL INDOLES
Author(s) -
Johnston David Samuel
Publication year - 1982
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1982.tb03820.x
Subject(s) - indole test , tetracyanoethylene , intramolecular force , chemistry , photochemistry , hydrogen cyanide , absorption (acoustics) , excited state , absorption spectroscopy , charge (physics) , spectral line , visible spectrum , stereochemistry , organic chemistry , atomic physics , physics , optics , quantum mechanics , astronomy
— Indole and tetracyanoethylene form a purple charge transfer complex which decomposes into 3‐tricyanovinyI indole and hydrogen cyanide in neutral or basic media. In acid media, 2‐tricyanovinyI indole is formed. 3‐Tricyanovinyl indole has an intense visible absorption at 460 nm, the 2‐isomer is colourless. It is suggested that the visible absorption of 3‐tricyanovinyl indole is due to intramolecular charge transfer and that such a transition is not observed in the case of the 2‐isomer because of a higher excited state energy.