ABSTRACT
Tetrahedral coordination is the coordination geometry most frequently found in vanadate and its oligomers and in reaction products with monodentate ligands. The situation changes with bidentate ligands, where pentacoordination is most frequently encountered with monoligated species, whereas hexacoordination is generally encountered with bisligated vanadates, if the latter products form. An example of unusually high coordination is afforded by amavadin that has been oxidized to the V(V) state. This V(V) complex is eight-coordinate [1] and is also unusual in that there is no V-oxo group.
