The Chemiluminescence of Indole Derivatives. I

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Abstract
The chemiluminescence of forty-one indole derivatives has been investigated by using two types of reaction mixtures: (A) the EtOH-KOH-H2O2-K3Fe(CN)6-Sample and (B) the DMSO-KOH-Sample. In both systems the reactions were carried out in the presence of air. The light intensity of chemiluminescence was measured by the deflection of the microammeter of the photometer or recorded by a connected automatic recorder. The relative light intensity (RLI), the ratio of the maximum intensity of the chemiluminescence of the sample to that of indole, was also measured. The electron-repelling group, such as hydroxyl and substituted aminovinyl group, at the 3- or 5-position enhanced the RLI, but alkyl, acetyl, formyl groups or chlorine at the various positions had little effect or a negative effect on the RLI. Some of the compounds showed a maximum intensity soon after the reagents were mixed, while some others slowly showed a maximum, which then decayed slowly.