Carbon Subsulphide, C₃S₂

Carbon Subsulphide, C₃S₂ is the analogue of the suboxide, C₃O₂. It is a deep red, tear-exciting liquid, obtained by Lengyl as one of the products when carbon disulphide vapour was submitted to the action of an electric arc. With bromine it forms a yellow solid of composition C₃S₂Br₆. Carbon subsulphide has also been prepared by striking an arc between a carbon cathode and an anode consisting of antimony containing 7 per cent, of carbon, placed beneath the surface of liquid carbon disulphide. The constitutional formula S:C:C:C:S is attributed to this compound.

A sulphide C₂S₃ is described by Low as a brown, odourless, amorphous substance, only sparingly soluble in carbon disulphide. It is said to be formed during the thermal decomposition of the disulphide.