Pervanadyl

Pervanadyl (VO+2) is a pale yellow^[1] oxycation of vanadium(V). It is the predominant vanadium(V) species in acidic solutions with pH between 0 and 2, and its salts are formed by protonation of vanadium(V) oxide in such solutions:^[2][3]

V₂O₅ + 2 H⁺ → 2 VO+2 + H₂O (K = 3.42×10⁻²)

Pervanadyl

Identifiers
3D model (JSmol)	Interactive image
InChI InChI=1S/2O.V/q;;+1 Key: UAZIGFGVBWJXOL-UHFFFAOYSA-N
SMILES O=[V+]=O
Properties
Chemical formula	O2V+
Molar mass	82.939 g·mol−1
Related compounds
Related compounds	Vanadyl
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

The ion can form a complex with a single aminopolycarboxylate ligand,^[4] or with tridentate Schiff base ligands.^[5]

The VO+2/VO²⁺ redox couple is used at the cathode of the vanadium redox battery.^[6] The standard reduction potential of this couple is +1.00 V.^[7]

From left to right: VO+2, VO²⁺, V³⁺, and V²⁺ in aqueous solution.

See also

• Vanadate, vanadium(V) oxyanions

References

1. Kustin, Kenneth; Macara, Ian G. (November 1982). "The New Biochemistry of Vanadium". Comments on Inorganic Chemistry. 2 (1–2): 1–22. doi:10.1080/02603598208078107.
2. Bard, Allen J. (1985). Standard potentials in aqueous solution (1st ed.). New York: CRC Press. ISBN 9781351414746.
3. LaSalle, M. J.; Cobble, James W. (June 1955). "The Entropy and Structure of the Pervanadyl Ion". The Journal of Physical Chemistry. 59 (6): 519–524. doi:10.1021/j150528a010.
4. Yamada, Shinkichi.; Ukei, Yuko.; Tanaka, Motoharu. (April 1976). "Kinetics and mechanism of the complexation reactions of pervanadyl ion with some aminopolycarboxylates". Inorganic Chemistry. 15 (4): 964–967. doi:10.1021/ic50158a048.
5. Pal, Satyanarayan; Pal, Samudranil (2000). "A dimeric pervanadyl (VO2+) complex with a tridentate Schiff base ligand". Journal of Chemical Crystallography. 30 (5): 329–333. doi:10.1023/A:1009561224540. S2CID 91300997.
6. Jin, Jutao; Fu, Xiaogang; Liu, Qiao; Liu, Yanru; Wei, Zhiyang; Niu, Kexing; Zhang, Junyan (25 June 2013). "Identifying the Active Site in Nitrogen-Doped Graphene for the VO 2+ /VO 2 + Redox Reaction". ACS Nano. 7 (6): 4764–4773. doi:10.1021/nn3046709. PMID 23647240.
7. Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, ISBN 0-471-19957-5