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Atomistry » Sulphur » Compounds » Sulphur Oxytetrachloride | ||
Atomistry » Sulphur » Compounds » Sulphur Oxytetrachloride » |
Sulphur Oxytetrachloride, S2O3Cl2
During the preparation of sulphur monochloride, Millon in 1838 obtained a substance which he described as a crystalline sulphur chloride; its formation was due to the presence of moisture during the action, and similar crystals can be formed by introducing a little sulphur monochloride into a flask filled with moist chlorine. The composition of the crystals has since been shown to be represented by Sulphur Oxytetrachloride, S2O3Cl2.
A more convenient method of preparation is to pass chlorine into a mixture of sulphur monochloride with a bimolecular proportion of chlorosulphonic acid at -15° C., until solidification occurs. Probably sulphur tetrachloride is first formed and then reacts with the chlorosulphonic acid: SCl4 + Cl.SO2.OH = Cl.SO2.O.SCl8 + HCl Sulphur oxytetrachloride is a pungent, colourless, crystalline solid of m.pt. 57° C., with decomposition. Even when kept at the ordinary temperature it gradually liquefies on account of decomposition into thionyl and sulphuryl chlorides; if decomposed rapidly at higher temperatures, the latter compound is naturally accompanied by or even replaced by its dissociation products. S2O8Cl2 = SOCl2 + SO2Cl2. Treatment with water causes hydrolysis to sulphuric and sulphurous acids, together with hydrochloric acid: S2O3Cl2 + 4H2O = H2SO3 + H2SO4 + 4HCl. Sulphuric acid reacts with sulphur oxytetrachloride as with sulphuryl chloride, yielding chlorosulphonic acid. In accordance with its reactions the constitution of sulphur oxytetrachloride must be regarded as represented by Cl.SO2.O.SCl3. |
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