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Vanadium compounds are compounds formed by the element vanadium (V). The chemistry of vanadium is noteworthy for the accessibility of the four adjacent oxidation states 2–5, whereas the chemistry of the other group 5 elements , niobium and tantalum , are somewhat more limited to the +5 oxidation state. [ 1 ]
Organovanadium chemistry is the chemistry of organometallic compounds containing a carbon (C) to vanadium (V) chemical bond. [1] Organovanadium compounds find only minor use as reagents in organic synthesis but are significant for polymer chemistry as catalysts. [2] Oxidation states for vanadium are +2, +3, +4 and +5.
The organometallic chemistry of vanadium is well–developed. Vanadocene dichloride is a versatile starting reagent and has applications in organic chemistry. [49] Vanadium carbonyl, V(CO) 6, is a rare example of a paramagnetic metal carbonyl. Reduction yields V (CO) −
Similar in size and charge to phosphorus(V), vanadium(V) also parallels its chemistry and crystallography. Orthovanadate V O 3− 4 is used in protein crystallography [35] to study the biochemistry of phosphate. [36] Beside that, this anion also has been shown to interact with activity of some specific enzymes.
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 [V(CN) 6 ] 3− and [V 2 Cl 9 ] 3− are referred to as hexacyanovanadate(III) and nonachlorodivanadate(III), respectively.
The intense blue color of Prussian blue is a consequence of an intervalence charge transfer band. In chemistry, intervalence charge transfer, often abbreviated IVCT or even IT, is a type of charge-transfer band that is associated with mixed valence compounds. It is most common for systems with two metal sites differing only in oxidation state.
The vanadyl or oxovanadium(IV) cation, VO 2+, [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 V 4+ and O 2− centers. [2]
C corresponds to the electronic charge of the species relative to the site that it occupies. The charge of the species is calculated by the charge on the current site minus the charge on the original site. To continue the previous example, Ni often has the same valency as Cu, so the relative charge is zero. To indicate a null charge, × is used.