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

Vanadyl Sulphites

Normal sulphites containing tetravalent vanadium have not hitherto been prepared in consequence of the readiness with which hydrolysis takes place. A considerable number of vanadyl sulphites are, however, known, as well as their double salts, which, no doubt, are heteropoly-acid compounds.

When a mixture of the oxides V2O3 and V2O4, resulting from the decomposition of ammonium metavanadate, is treated in boiling aqueous solution with sulphur dioxide, a blue liquid is obtained from which under suitable conditions the following blue, crystalline hydrates of vanadyl sulphite, VOSO3, can be isolated: VOSO3.3H2O; VOSO3. 4H2O; VOSO3.8H2O. The liquid also gives rise to an amorphous, green, hydrated, basic vanadyl sulphite, VO2.VOSO3.4½H2O or 2VO2.SO2.4½H2O. Another blue, crystalline complex sulphite, having the composition 4VO2.3SO2.10H2O, has been prepared by a similar process, and by reducing barium metavanadate in aqueous suspension, the blue, crystalline compound 3VO2.2SO2.4½H2O results.

Double Salts of Vanadyl Sulphite

By the action of sulphur dioxide on vanadates in the presence of varying molecular proportions of alkali sulphites, two series of alkali vanadyl sulphites have been obtained.

Series I

This consists of blue compounds having the general formula R2O.3VO2.2SO2.xH2O, which can be regarded as derivatives of the vanadyl sulphite, 3VO2.2SO2.4½H2O, which can be alternatively written, H2O.3VO2.2SO2.3½H2O. The following have been prepared: (NH4)2O.3VO2.2SO2.H2O; Na2O.3VO2.2SO2.3H2O; K2O.3VO2.2SO2; and ZnO.3VO2.2SO2.

Series II

This comprises green substances which are generally less stable than the members of former series, and have the general formula R2O.VO2.2SO2.xH2O. The following are known:

(NH4)2SO3.VOSO3.1 or 2 H2O or (NH4)2O.VO2.2SO2.1 or 2H2O.
Na2SO3.VOSO3.5H2O\t or Na2O.VO2.2SO2.5H2O.
K2SO3.VOSO3.2H2O or K2O.VO2.2SO2.2H2O.

In addition to the foregoing, Gain has prepared a large number of alkali vanadyl sulphites in which the proportions of basic oxide, vanadium dioxide, and sulphur dioxide vary considerably:


It is improbable that these are all true individual chemical compounds.
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