Chemical elements
  Tellurium
    Isotopes
    Energy
    Production
    Physical Properties
    Chemical Properties
    Physiological_Action
    Atomic Weight
    Alloys
    Detection
    Estimation
    Compounds
      Hydrogen Telluride
      Tellurium Tetrafluoride
      Tellurium Hexafluoride
      Tellurium Oxyfluorides
      Tellurium Dichloride
      Tellurium Tetrachloride
      Tellurium Perchlorate
      Tellurium Dibromide
      Tellurium Tetrabromide
      Tellurium Oxybromides
      Tellurium Tetra-iodide
      Tellurium Monoxide
      Tellurium Dioxide
      Tellurites
      Tellurium Trioxide
      Telluric Acids
      Tellurates
      Tellurium Disulphide
      Tellurium-Sulphur Sesquioxide
      Tellurium Sulphates
      Telluropentathionic Acid
      Tellurium Nitride
      Tellurium Nitrite
      Basic Tellurium Nitrate
      Carbon Sulphidotelluride
      Tellurium Dicyanide
    Application
    PDB 1el7-4fon

Tellurium Dicyanide, Te(CN)2






Tellurium tetrabromide and silver cyanide in a suitable organic solvent such as benzene react according to the equation

TeBr4 + 3AgCN = Te(CN)2 + 3AgBr + CNBr.

The tellurium cyanide may be obtained as a colourless solution on extraction with ether. On evaporation and crystallisation of this solution a double compound of cyanide and ether is obtained, from which the pure cyanide may be prepared by distillation in vacuo.

Tellurium dicyanide after a few minutes' exposure to air assumes a graphite-like appearance due to the deposition of tellurium. Water and alkalis hydrolyse it with precipitation of tellurium:

2Te(CN)2 + 3H2O = Te + TeO(OH)2 + 4HCN.

When heated in air the cyanide burns with a pale blue flame. It is soluble to a slight extent in chloroform and carbon tetrachloride. It is also soluble in cold methyl alcohol without change, but when the solution is warmed hydrolysis occurs.

Tellurium dicyanide decomposes into tellurium and cyanogen to a slight extent at 100° C. The decomposition increases more rapidly above this temperature. At about 190° C. there is a sudden increase in the rate of evolution of the gas.


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