Tautomersim and Spectral Properties of Alizarin (1,2-Dihydroxyanthracene-9, 10-Dione)
No Thumbnail Available
Date
2007-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa Universty
Abstract
This paper mainly tends to explain the dual fluorescence of alizarin and its structures that
are responsible for the existence of fluorescence emission spectra different from
absorption spectra. And uses structural isomerism (Tautomersim) to explain the dual
fluorescence shown by this compound. As well the affect of the PH of the media, polarity
of the solvent and hydrogen bond forming tendency of solvents on both absorption and
fluorescence emission spectra of alizarin were studied. Four alizarin tautomers were
selected for simplicity that may exist in both ground and excited state or only in one of
the two states. The structure of this compound is investigated both experimentally and
theoretically. Experimentally its absorption, fluorescence emission spectra and 1H NMR
were done and computational techniques (HF, DFT and semiemperical) were used to
calculate total energy, Gibbs free energy, dipole moment, excitation energy and other
molecular parameters.
Key words: Alizarin, fluorescence, tautomers, computational, absorption, protic,
aprotic and 1H NMR
Description
Keywords
Alizarin, Fluorescence, Tautomers, Computational, Absorption, Protic, aprotic and 1H NMR.