Chemical elements
    Physical Properties
    Chemical Properties
      Hypovanadous Oxide
      Vanadous Oxide
      Hypovanadic Oxide
      Vanadic Oxide
      Hypovanadous Fluoride
      Vanadous Fluoride
      Vanadium Tetrafluoride
      Vanadium Pentafluoride
      Vanadyl Difluoride
      Vanadium Oxytrifluoride
      Vanadium Dioxyfluoride
      Hypovanadous Chloride
      Vanadous Chloride
      Hypovanadic Chloride
      Divanadyl Chloride
      Vanadium Oxymonochloride
      Vanadyl Dichloride
      Vanadium Oxytrichloride
      Vanadium Oxydichloride
      Vanadous Bromide
      Hypovanadic Bromide
      Vanadium Oxymonobromide
      Vanadyl Dibromide
      Vanadium Oxytribromide
      Hydrated Vanadium Tri-iodide
      Vanadium Suboxide
      Hypovanadous Oxide
      Vanadous Oxide
      Hypovanadic Oxide
      Intermediate Vanadium Oxides
      Vanadium Pentoxide
      Sodium Stannovanadates
      Double Vanadates
      Heteropoly-Acids with Vanadium
      Pervanadic Acid
      Vanadium Monosulphide
      Vanadium Trisulphide
      Vanadium Pentasulphide
      Vanadium Oxysulphides
      Hypovanadous Sulphate
      Vanadous Sulphate
      Vanadyl Sulphites
      Vanadyl Sulphates
      Vanadic Sulphates
      Vanadyl Dithionate
      Ammonium Orthothiovanadate
      Ammonium Pyroxyhexathiovanadate
      Sodium Orthoxytrithiovanadate
      Sodium Orthoxymonothiovanadate
      Vanadium Selenides
      Vanadyl Selenite
      Vanadyl Selenates
      Vanadium Subnitride
      Vanadium Mononitride
      Vanadium Dinitride
      Alkali Vanadyl Nitrites
      Vanadium Nitrates
      Vanadyl Hypophosphite
      Vanadyl Phosphates
      Vanadous Pyrophosphate
      Vanadyl Arsenates
      Vanadium Carbide
      Vanadyl Cyanide
      Potassium Vanadocyanide
      Potassium Vanadicyanide
      Vanadium Ferrocyanides
      Ammonium Vanadyl Thiocyanate
      Vanadium Subsilicide
      Vanadium Disilicide
      Vanadium Boride
    Detection, Estimation
    PDB 1b8j-2i4e
    PDB 2jhr-6rsa


Alkali vanado-phosphates are numerous, and contain from one to twelve molecules of vanadium pentoxide in combination with one molecule of phosphorus pentoxide. Those with high vanadium pentoxide content are red, crystalline substances, and are called purpureo-compounds; those with low vanadium pentoxide content form yellow crystals, and are styled luteo-compounds.

Purpureo Series

These are prepared by dissolving vanadium pentoxide in solutions of alkali phosphates. The following are known:

7(NH4)2O.P2O5.12V2O5.26H2O or (NH4)7[P(V2O6)6].13H2O;
5(NH4)2O.P2O5.12V2O5.44H2O or (NH4)5H2[P(V2O6)6].21H2O;
7K2O.P2O5.12V2O5.26H2O or K7[P(V2O6)6].13H2O;
5K2O.P2O5.10V2O5.26H2O or K5H2[P(V2O6)5O].12H2O;

together with caesium and rubidium compounds analogous to the last member of the above.

Luteo Series

These are prepared by adding excess of phosphoric acid to solutions of alkali vanadates. The following are known:

(NH4)2O.P2O5-V2O5.1 or 3H2O or ;
(NH4)2O.P2O5.2V2O5.5 or 7H2O or or 7H2O;
2K2O.P2O5.V2O5 or
K2O.P2O5.2V2O5.6 or 7H2O; 3K2O.2P2O5.2V2O5.5H2O; 3K2O.4P2O5.6V2O5.2lH2O.

A free acid having the composition 2HVO3.2HPO3.9H2O or

has been obtained in golden-yellow leaves by the action of vanadium pentoxide on syrupy phosphoric acid.
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