Abstract
The room temperature electronic absorption and fluorescence spectra of the pharmacologically active β-carboline alkaloids norharman, harmane, harmine, harmaline, reserpine and yohimbine are measured in moderately and highly concentrated hydroxide solutions. The appearance of a new fluorescence emission band in the latter madia for all the compounds under study was ascribed to anions in which the NH group of the indole ring is deprotonated. The differences between the acidities of their excited singlet states and their ground states are estimated by means of the Förster-Weller cycles.
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