Not to be confused with the
pervanadyl ion, with the formula VO+ 2.
The vanadyl or oxovanadium(IV)
cation, VO2+,[1] is a
functional group that is common in the
coordination chemistry of
vanadium. Complexes containing this functional group are characteristically blue and paramagnetic. A triple bond is proposed to exist between the V4+ and O2− centers.[2] The description of the bonding in the vanadyl ion was central to the development of modern
ligand-field theory.[3]
VO2+, often in an ionic pairing with sodium (NaH2VO4), is the second most abundant
transition metal in
seawater, with its concentration only being exceeded by
molybdenum.[4] In the ocean the average concentration is 30
nM. Some
mineral watersprings also contain the ion in high concentrations. For example, springs near
Mount Fuji often contain as much as 54
μg per
liter.[4]