Abstract
Existing views on the deprotonation and complexation of 1-amino-4-hydroxyanthraquinone are wrong. This compound, its anions, and complexes with metals are not individual substances, but they form a dynamic equilibrium mixture of keto-enol (keto-oxide) and amino-imine tautomers. Different samples of the same compound differ by the tautomeric composition, the respective information is contained in their electron absorption spectra. In weak alkaline solutions the deprotonation occurs exclusively at the hydroxy group. Most typical structure of 1-amino-4-hydroxyanthraquinone anions is 1,10-quinoid, its metal complexes have 9,10-and 1,10-quinoid structures. The ground states of molecules are more responsible for the tautomeric transformations than the excited states. Quantum-chemical calculations of tautomeric anthraquinones by semiempirical PPP methods are more reliable than modern ab initio calculations.
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Original Russian Text © V.Ya. Fain, B.E. Zaitsev, M.A. Ryabov, P.V. Strashnov, 2010, published in Zhurnal Obshchei Khimii, 2010, Vol. 80, No. 10, pp. 1676–1685.
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Fain, V.Y., Zaitsev, B.E., Ryabov, M.A. et al. Quantum-chemical and correlation study of deprotonation and complexation of 1-amino-4-hydroxyanthraquinone. Russ J Gen Chem 80, 1986–1995 (2010). https://doi.org/10.1134/S107036321010018X
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DOI: https://doi.org/10.1134/S107036321010018X