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Heating a suspension of vanadium pentoxide and phosphoric acid gives VOPO 4 •2H 2 O, isolated as a bright yellow solid. [4] According to X-ray crystallography, the V(V) centers are octahedral, with long, weak bonds to aquo ligands. [5] Reduction of this compound with alcohols gives the vanadium(IV) phosphates.
From left: [V(H 2 O) 6] 2+ (lilac), [V(H 2 O) 6] 3+ (green), [VO(H 2 O) 5] 2+ (blue) and [VO(H 2 O) 5] 3+ (yellow).. 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 ...
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.
Vanadium is a chemical element; it has symbol V and atomic number 23. It is a hard, silvery-grey, malleable transition metal . The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer ( passivation ) somewhat stabilizes the free metal against further oxidation .
Vanadinite is a mineral belonging to the apatite group of phosphates, with the chemical formula Pb 5 (V O 4) 3 Cl. It is one of the main industrial ores of the metal vanadium and a minor source of lead. A dense, brittle mineral, it is usually found in the form of red hexagonal crystals.
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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] V 2 O 5 + 2 H + → 2 VO + 2 + H 2 O (K = 3.42 × 10 −2) The ion can form a complex with a single aminopolycarboxylate ligand, [4] or with tridentate Schiff base ligands ...
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