Metal Complexes of Alizarin II—The Structure of Some Metal Complexes of Alizarin other than Turkey Red

The molecular structures of some complexes of alizarin have been established. It has been shown that all these compounds have the sane general type of structure and that they consist of a complex anion (a chelate of alizarin with a trivalent metal) with a uni‐, bi‐ or quadri‐valent metal cation. Before complex formation, salt formation of the alizarin molecule is necessary, because otherwise complex formation will be very...