Fluorescence of harmol, harmalol and 2-hydroxycarbazole in concentrated hydroxide solutions

Pharm Weekbl Sci. 1990 Aug 24;12(4):142-4. doi: 10.1007/BF01970154.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbazoles / analysis*
  • Harmaline / analogs & derivatives*
  • Harmaline / analysis
  • Harmine / analogs & derivatives*
  • Harmine / analysis
  • Hydrogen-Ion Concentration
  • Hydroxides
  • Potassium
  • Potassium Compounds*
  • Solutions
  • Spectrometry, Fluorescence
  • Spectrophotometry, Ultraviolet

Substances

  • Carbazoles
  • Hydroxides
  • Potassium Compounds
  • Solutions
  • harmalol
  • harmol
  • Harmine
  • 2-hydroxycarbazole
  • Harmaline
  • Potassium
  • potassium hydroxide