Abstract
Amavadine is a vanadium natural product from the mushroom Amanita muscaria. Earlier reports have characterized the compound as a vanadyl (VO 2+) complex with two N-hydroxy-αα-iminodipropionic acid ligands, but no hypothesis as to its function has yet been put forward. We report here the synthesis, isolation, and properties of bis(iminodiacetato)oxovanadium(IV) and bis(αα-iminodipropionato)oxovanadium(IV). The complex bis(ββ-iminodipropionato)oxovanadium(IV) has been prepared in solution. These complexes serve as models for Amavadine. The structures of the models are analogous to that of Amavadine, with two bidentate, singly charged ligands bonding through one oxygen and one nitrogen atom. The visible spectra suggest the possibility of 1:1 complexes in solution in addition to the 2:1 ligand to metal complexes. Preliminary electrochemical data suggest reversible V(IV) ⇌ V(III) couples.
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