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5,6-Benzindole was obtained by the photochemical decomposition of 4-hydroxy-6,7benzo-quinoline-3-diazonium hydrochloride. A substantial difference in the absorption and luminescence spectra of linear benzindole and its angular isomers was observed. It is shown that in the formation of complexes by means of hydrogen bonds the frequency of the associated NH group of linear benzindole is closer to the corresponding value for indole than the frequencies of the angular isomers.
KeywordsHydrogen Hydrogen Bond Organic Chemistry Hydrochloride Indole
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