Perthiocyanogen, HC3N3S3, is a yellow, amorphous powder, insoluble in water, alcohol, ether and concentrated sulphuric acid; it can be obtained by the action of chlorine or boiling dilute nitric acid on an aqueous solution of potassium thiocyanate. It is decomposed by heat according to the equation:
3HC3N3S3 = 3CS2 + 3S + H3C6N9 (Mellone.)
With concentrated potassium hydroxide solution thiocyanic acid is obtained. |