The Structural Characterization of Amavadin
Articles > Article · 1999
Authors: Robert E. Berry, Elaine M. Armstrong, Roy L. Beddoes, David Collison, S. Nigar Ertok, Madeleine Helliwell, C. David Garner
Angewandte Chemie International Edition, International, WoS, 1999, vol 38, pp 795-797
DOI: 10.1002/(sici)1521-3773(19990315)38:6<795::aid-anie795>3.0.co;2-7
Summary
Fly agaric accumulate vanadium in the form of amavadin, whose structure has been elucidated (see picture for the crystal structure). Amavadin contains one VIV center coordinated to two (S,S)-hidpa3− ligands (H3hidpa=2,2′-(hydroxyimino)dipropionic acid) through one η2-NO− group and two unidentate carboxylato groups from each ligand. The arrangement of the two η2-NO− groups leads to a chiral vanadium center, which has been characterized in both the Λ and Δ forms. The carboxylato groups of the amavadin anions bind cations, for example, Ca2+ ions, and/or become involved in hydrogen bonding.