Chemical elements
    Physical Properties
    Chemical Properties
      Carbon Tetrafluoride
      Carbon Tetrachloride
      Carbon Tetrabromide
      Carbon Tetraiodide
      Carbon Oxychloride
      Carbonyl Chloride
      Carbon Oxybromide
      Carbonyl Bromide
      Carbon Suboxide
      Carbon Monoxide
      Carbon Dioxide
      Percarbonic Acid
      Carbamic Acid
      Carbon Disulphide
      Carbonyl Sulphide
      Carbon Oxysulphide
      Thiocarbonyl Chloride
      Thiocarbonic Acid
      Thiocarbamic acid
      Carbon Monosulphide
      Carbon Subsulphide
      Carbon Sulphidoselenide
      Carbon Sulphidotelluride
      Carbon Nitrides
      Hydrocyanic Acid
      Prussic Acid
      Cyanogen Chloride
      Cyanogen Bromide
      Cyanogen Iodide
      Polymerised Cyanogen Halides
      Cyanic Acid
      Cyanuric Acid
      Fulminic Acid
      Thiocyanic Acid
      Sulphocyanic Acid
      Isoperthiocyanic Acid
      Cyanogen Sulphide
      Thiocyanic Anhydride
    Amorphous Carbon

Isoperthiocyanic Acid, C2S3(NH)2

Isoperthiocyanic Acid, C2S3(NH)2, as stated above, is formed by the action of acid of moderate strength - e.g. 40 per cent, hydrochloric acid - on ammonium thiocyanate. It can be crystallised from water in golden-yellow needles, and is reconverted by potassium cyanide into thiocyanate:

C2S3N2H2 + KCN = CNSK + 2CNSH.

That it is probably an iso-acid containing imide groups is shown by its reduction by nascent hydrogen to thiourea and carbon disulphide:

C2S3(NH)2 + 2H = CS(NH2)2 + CS2.

Salts of the isomeric normal perthiocyanic acid, C2N2S(SH)2, are formed by the action of alkalis on the iso-acid, but the free acid is unstable. Normal and iso-dithiocyanic acid, and respectively, are also known; as well as trithiocyanic acid, (CNSH)3, which is formed by the interaction of cyanuric chloride and alkali sulphide.

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