FORMATION AND STRUCTURE OF THE TRIS(CATECHOLATO)VANADATE(IV) COMPLEX IN AQUEOUS-SOLUTION

The coordination chemistry of simple catechols continues to be the object of extensive interest because of this ligand’s involvement at the active sites of biological chelators, e.g. siderophores.2-11Catechols have a pronounced affinity for ions in high oxidation states or with high charge-to-radius ratios. Low molecular weight pigments known as tunichromes serve as complexing agents in the accumulation and storage of vanadium in some marine organisms. The catechol derivative, tunichrome b1has been isolated from the blood of Ascidia nigra and is suggested to be such a vanadium complexing agent.12-14. © 1990, American Chemical Society. All rights reserved.