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Pervanadyl () is a pale yellow 
oxycation
In chemistry, an oxycation is a polyatomic ion with a positive charge that contains oxygen.
Examples
* Dioxygenyl ion,
* Nitrosonium ion,
* Nitronium ion,
* Vanadyl ion, VO2+, a very stable oxycation
* Uranyl ion, , all natural U6+ occurs in ...
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
Vanadium(V) oxide (''vanadia'') is the inorganic compound with the formula V2 O5. Commonly known as vanadium pentoxide, it is a brown/yellow solid, although when freshly precipitated from aqueous solution, its colour is deep orange. Because ...
in such solutions:
: ('' K'' = )
The ion can form a complex with a single aminopolycarboxylate ligand, or with tridentate Schiff base
In organic chemistry, a Schiff base (named after Hugo Schiff) is a compound with the general structure ( = alkyl or aryl, but not hydrogen). They can be considered a sub-class of imines, being either secondary ketimines or secondary aldimine ...
ligands.
The / redox couple is used at the cathode of the vanadium redox battery
The vanadium redox battery (VRB), also known as the vanadium flow battery (VFB) or vanadium redox flow battery (VRFB), is a type of rechargeable flow battery. It employs vanadium ions as charge carriers. The battery uses vanadium's ability t ...
. The standard reduction potential
Redox potential (also known as oxidation / reduction potential, ''ORP'', ''pe'', ''E_'', or E_) is a measure of the tendency of a chemical species to acquire electrons from or lose electrons to an electrode and thereby be reduced or oxidised respe ...
of this couple is +1.00 V.
See also
*Vanadate
In chemistry, a vanadate is an anionic coordination complex of vanadium. Often vanadate refers to oxoanions of vanadium, most of which exist in its highest oxidation state of +5. The complexes and are referred to as hexacyanovanadate(III) and no ...
, vanadium(V) oxyanions
References
{{reflist Vanadyl compounds Vanadium(V) compounds Oxycations