Chemical elements
  Thorium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Thorium Hydride
      Thorium Fluoride
      Thorium Oxyfluoride
      Potassium Thorifluoride
      Thorium Chloride
      Thorium Oxychloride
      Complex Thorium Chlorides
      Thorium Bromide
      Thorium Oxybromide
      Thorium Iodide
      Thorium Dioxide
      Thoria
      Metathorium Oxide
      Thorium Hydroxide
      Thorium Superoxide
      Thorium Sulphide
      Thorium Sulphite
      Thorium Sulphate
      Complex Thorium Sulphates
      Thorium Selenite
      Thorium Selenate
      Thorium Nitride
      Thorium Nitrate
      Thorium Orthophosphate
      Thorium Arsenates
      Thorium Carbide
      Thorium Carbonate
      Thorium Formate
      Thorium Acetate
      Thorium Oxalate
      Thorium Tartrate
      Thorium Acetylacetone
      Thorium Silicide
      Thorium Silicate
      Thorium Borides

Thorium Acetylacetone, Th(C5H7O2)4






In common with other rare earth metals, thorium forms a solid compound with acetylacetone - Thorium Acetylacetone, Th(C5H7O2)4. It is obtained by the action of acetylacetone on thorium hydroxide, of sodium acetylacetone on thorium salts, or in nearly quantitative yield by adding a solution of a thorium salt to a faintly alkaline solution of acetylacetone, and precipitating with the smallest quantity of ammonia. The product can be crystallised from alcohol, melts at 171° C., and may be sublimed under reduced pressure without appreciable decomposition; its molecular weight in carbon tetrachloride solution confirms the formula Th(C5H7O2)4. With ammonia it forms the addition compound [Th(C5H7O2)4]2.NH3. The stereochemical constitution of thorium and other metallic acetylacetones presents an interesting problem.
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