Chemical elements
    Amorphous Sulphur
    Colloidal Sulphur
    Physical Properties
    Chemical Properties
      Hydrogen Sulphide
      Metal Polysulphides
      Hydrogen Polysulphides
      Hydrogen Pentasulphide
      Hydrogen Trisulphide
      Hydrogen Disulphide
      Sulphur Monofluoride
      Sulphur Tetrafluoride
      Sulphur Hexafluoride
      Sulphur Monochloride
      Sulphur Dichloride
      Sulphur Tetrachloride
      Sulphur Monobromide
      Thionyl Fluoride
      Sulphuryl Fluoride
      Fluorosulphonic Acid
      Thionyl Chloride
      Sulphuryl Chloride
      Sulphur Oxytetrachloride
      Pyrosulphuryl Chloride
      Chlorosulphonic Acid
      Thionyl Bromide
      Sodium Sulphoxylate
      Sulphur Dioxide
      Sulphurous Acid
      Sulphur Trioxide
      Pyrosulphuric Acid
      Sulphuric Acid
      Persulphuric Anhydride
      Persulphuric Acid or Perdisulphuric Acid
      Permonosulphuric Acid
      Amidopermonosulphuric Acid
      Thiosulphuric Acid
      Polythionic Acids
      Dithionic Acid
      Trithionic Acid
      Tetrathionic Acid
      Pentathionic Acid
      Wackenroders Solution
      Hexathionic Acid
      Polythionic Acids
      Sulphur Sesquioxide
      Hydrosulphurous Acid
      Nitrogen Sulphide
      Nitrogen Persulphide
      Nitrogen Pentasulphide
      Nitrogen Chlorosulphide
      Trithiazyl Chloride
      Thiotrithiazyl Chloride
      Dithiotetrathiazyl Chloride
      Nitrogen Bromosulphide
      Thiotrithiazyl Bromide
      Thiotrithiazyl Iodide
      Thiotrithiazyl Nitrate
      Thiotrithiazyl Hydrogen Sulphate
      Thiotrithiazyl Thiocyanate
      Sulphonic Acids
      Amidosulphonic Acid
      Imidosulphonic Acid
      Nitrilosulphonic Acid
      Hydroxylamine-monosulphonic Acid
      Nitrososulphonic Acid
      Hydroxylamine-disulphonic Acid
      Hydroxylamine-isodisulphonic Acid
      Hydroxylamine-trisulphonic Acid
      Dihydroxylamidosulphonic Acid
      Sulphazinic Acid
      Sulphazotinic Acid
      Dehydrosulphazotinic Acid
      Nitrosulphonic Acid
      Nitrosulphonyl Chloride
      Nitrosulphonic Anhydride
      Nitrosulphuric Acid
      Nitrosodisulphonic Acid
      Sulphonitronic Acid
      Sulphates of Hydroxylamine
      Hydroxylamine Dithionate
      Hydrazine Dithionate
      Hydrazine Amidosulphonate
      Carbon Subsulphide
      Carbon Monosulphide
      Carbon Disulphide
      Thiocarbonic Acid
      Ammonium thiocarbonate
      Thiolcarbonic Acid
      Xanthic Acid
      Perthiocarbonic Acid
      Sodium perthiocarbonate
      Carbonyl Sulphide
      Thiocarbonyl Chloride
      Thiocarbonyl Tetrachloride or
      Carbon Hexachlorosulphide
      Trichloromethyl Disulphide
      Thiocarbonyl Sulphochloride
      Carbon Bromosulphide
      Amino-derivatives of Thiocarbonic Acid
      Dithiocarbamic Acid
      Azidodithiocarbonic Acid
      Cyanogen Monosulphide
      Cyanogen Trisulphide
      Sulphur Thiocyanate
      Disulphur Dithiocyanate
      Thiocyanic Acid
      Dithiocyanic Acid
      Trithiocyanuric Acid
      Perthiocyanic Acid

Azidodithiocarbonic Acid, HS.CS.N3

Azidodithiocarbonic Acid, HS.CS.N3, has been prepared by allowing sodium azide, NaN3, dissolved in a little water, to react with carbon disulphide; after keeping the mixture in a stoppered vessel at 40° C. for 48 hours, the resulting solution on treatment with concentrated hydrochloric acid at 0° C. yields a white or very pale yellow crystalline precipitate of the azido-acid. The crystals belong to the monoclinic system. The acid is fairly soluble in water, more soluble in organic solvents. It has the characteristic properties of a strong acid, and it is oxidised by various agents, yielding azido carbon disulphide, (S.CS.N3)2, some sulphate also being formed. At ordinary temperatures the acid undergoes spontaneous decomposition with formation of thiocyanic acid as an intermediate product,

HS.CS.N3 = HCNS + S + N2;

the resulting solid product consists of a mixture of polymerised thiocyanic acid and free sulphur.

The alkali azidodithiocarbonates may be obtained by the action of carbon disulphide vapour on an aqueous solution of the alkali azide at 40° C. With a 1 per cent, solution of sodium azide the action proceeds quantitatively:

NaN3 + CS2 = NaS.CS.N3.

If the SCSN3-group be considered as a unit, azidodithiocarbonic acid may be regarded as a halogenoid hydracid having the same relation to azido carbon disulphide as hydrogen chloride bears to chlorine, and undergoing ionisation in solution in accordance with:


Azido carbon disulphide, (S.CS.N3)2, may be prepared by the oxidation of the foregoing compound or its salts. It is a white, crystalline solid, very sparingly soluble in water. At ordinary temperatures it decomposes spontaneously, yielding nitrogen, sulphur and a polythiocyanogen:

(S.CS.N3)2 = 2N2 + 2S + (SCN)2.

It reacts with caustic potash in much the same manner as a halogen, forming the potassium salts of azidodithiocarbonic acid and azido-oxydithiocarbonic acid:

(S.CS.N3)2 + 2KOH = KS.CS.N3 + KOS.CS.N3 + H2O.

Potassium azide reacts with iodine in the presence of carbon disulphide to form potassium iodide and nitrogen as the final products, but the reaction appears to proceed according to the following scheme:
  1. KN3 + CS2 = KS.CS.N3,
  2. 2KS.CS.N3 + 2I = (S.CS.N3)2 + 2KI,
  3. 2KN3 + (S.CS.N3)2 = 2KS.CS.N3 + 3N2,
    or (S.CS.N3)2 = 2CS2 + 3N2.
The reaction is facilitated by the presence of alcohol or acetone, and it may be used for the determination of azides. The catalytic effect of sulphides and thiosulphates on this reaction has already been mentioned.

The following formula has been suggested for azido carbon disulphide:

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