Abstract
Most of the π l ,π* bands of metal alizarinates are shown to be due to the 2,9- or 1,2-anthraquinoid structures. Bimetallic alizarinates with the 9,10-anthraquinoid structure are not formed because of the adjacent negatively charged oxygen atoms. The long-standing dispute concerning the structure of red metal alizarinates is solved: complexation always occurs at the peri- or ortho-hydroxycarbonyl group and involves the tautomeric anthraquinoid forms.
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Fain, V.Y., Zaitsev, B.E. & Ryabov, M.A. Metal Complexes with Alizarin and Alizarin Red S: Electronic Absorption Spectra and Structure of Ligands. Russian Journal of Coordination Chemistry 30, 365–370 (2004). https://doi.org/10.1023/B:RUCO.0000026008.98495.51
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DOI: https://doi.org/10.1023/B:RUCO.0000026008.98495.51