Tautomersim And Spectral Properties Of Alizarin (12-dihydroxyanthracene-9 10-dione)

This paper mainly tends to explain the dual fluorescence of alizarin and its structures thatrnare responsible for the existence of fluorescence emission spectra different fromrnabsorption spectra. And uses structural isomerism (Tautomersim) to explain the dualrnfluorescence shown by this compound. As well the affect of the PH of the media, polarityrnof the solvent and hydrogen bond forming tendency of solvents on both absorption andrnfluorescence emission spectra of alizarin were studied. Four alizarin tautomers werernselected for simplicity that may exist in both ground and excited state or only in one ofrnthe two states. The structure of this compound is investigated both experimentally andrntheoretically. Experimentally its absorption, fluorescence emission spectra and 1H NMRrnwere done and computational techniques (HF, DFT and semiemperical) were used torncalculate total energy, Gibbs free energy, dipole moment, excitation energy and otherrnmolecular parameters.rnKey words: Alizarin, fluorescence, tautomers, computational, absorption, protic,rnaprotic and 1H NMR

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