Chemical elements
  Titanium
    Isotopes
    Energy
    Preparation
    Physical Properties
    Chemical Properties
      Titanium Trifluoride
      Titanium Tetrafluoride
      Hydrofluotitanic acid
      Potassium Titanifluoride
      Sodium Titanifluoride
      Titanium Dichloride
      Titanium Trichloride
      Titanium Tetrachloride
      Titanic Chloride
      Titanium Oxychlorides
      Hydrochlorotitanic Acid
      Addition Compounds of Titanium Tetrachloride
      Titanium Tribromide Hexahydrate
      Titanium Tetrabromide
      Titanic Bromide
      Hydrobromotitanic Acid
      Titanium Chlorobromides
      Titanium Di-iodide
      Titanium Tri-iodide
      Titanium Tetra-iodide
      Titanic Iodide
      Titanium Monoxide
      
Titanium Sesquioxide
      Titanium Dioxide
      Titanic Oxide
      Titanic Hydroxides
      Metatitanic Acid
      Titanates
      Titanium Monosulphide
      Titanium Sesquisulphide
      Titanium Disulphide
      Titanium Sulphates
      Titanous Sulphate
      Titanium Sesquisulphate
      Complex Sulphates of Tervalent Titanium
      Normal Titanic Sulphate
      Potassium Titanisulphate
      Potassium and Ammonium Titanylsulphates
      Titanous Nitride
      Titanic Nitride
      Titanamide
      Titanium Nitrogen Halides
      Titaninitric Acid
      Titanium Phosphide
      Titaniphosphoric Acid
      Titanium Carbide
      Titanium Cyanonitride
      Titanium Thiocyanates
      Titanium Sesquioxalate
      Titanitartrates and Allied Salts
      Titanium Silicide
      Pertitanates

Pertitanates






It was observed by Schone that the addition of hydrogen peroxide to a titanic solution produces a yellow colour. There are thus produced compounds of titanium superoxide, TiO3. This oxide is best produced, in a hydrated form, by slowly adding titanic chloride to dilute alcohol, followed by a large excess of hydrogen peroxide and then ammonia or other alkali. A reddish yellow liquid is thus produced from which a yellow precipitate gradually separates, which when dried corresponds approximately to the formula TiO3.3H2O. The question whether this compound may be really TiO2.H2O2.2H2O is to be answered in the negative by reason of the fact that its solution does not show the reaction with chromic acid characteristic of hydrogen peroxide, and also because of the existence of the fluoroxypertitanates (q.v.) which are anhydrous derivatives of TiO3. The constitution of TiO3.3H2O is therefore


or possibly


the titanium being in neither case more than quadrivalent.

Melikoff and Pissarjewski have prepared a number of salts of pertitanic acid with metallic superoxides by adding well-cooled hydrogen peroxide to TiO3.aq. followed by sufficient alkali to make a clear solution. The salts are then precipitated by alcohol. The following compounds have thus been obtained:

Na2O2.TiO3.3H2O, (NH4)2O2.TiO3.H2O2, BaO2.TiO3.5H2O, K2O2.TiO3.10H2O, (Na2O2)4.Ti2O7.10H2O.

The constitution of the first two salts is represented thus:

and

For the last and similar salts Melikoff and Pissarjewski assume the titanium to be more than quadrivalent, formulating (Na2O2)4.Ti2O7.10H2O as



The fluoroxypertitanates, to which reference has been made above, are formed when alkali or alkaline earth fluoride is added to a titanic acid solution containing hydrogen peroxide. The following are examples of these crystalline salts:

TiO2F2.3NH4F, TiO2F2.2KF, TiO2F2.BaF2.

They are derivatives of pertitanic acid, in which an atom of oxygen has been replaced by two of fluorine; and are decomposed by hydrofluoric acid thus:

TiO2F2 + 2HF = TiF4 + H2O2.

The constitution of TiO2F2.2KF may be thus represented:



Mazzucchelli and Pantanelli have prepared the following inorganic salts of titanium peroxide:

TiO2(KSO4)2.7H2O, TiO2(NaSO4)2.10H2O, TiO2(NH4SO4)2.xH2O, TiO2(LiSO4)2.7H2O, TiO2Cl2.2NaCl.9H2O, TiO3.P2O5.Na2O.3H2O. O(TiO2.P2O5.Na2O)2.24H2O.


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