Abstract:Room temperature electronic absorption and fluorescence spectra of harmol, harmalol and 2-hydroxycarbazole have been obtained in concentrated aqueous potassium hydroxide solutions. The appearance of a new fluorescence band for all these compounds in media of H- greater than 16, has been ascribed to the emission of excited dianions formed by deprotonation. Acidity constants have been estimated from the Föster-Weller method.
3,4-dihydro-β-carbolines (DHβCs) are a set of endogenously synthetized alkaloids spread in a great variety of living species (e. g., plants, animals and microorganisms), playing a broad spectrum of biological, biochemical...
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