Higher sulfur oxides

Higher sulfur oxides

Higher sulfur oxides are a group of chemical compounds with the formula SO3+x where x lies between 0 and 1. They contain peroxo (O-O) groups and the oxidation state of sulfur is +6 as in SO3.
Monomeric SO4 can be isolated at low temperatures(below 78°K) following the reaction of SO3 and atomic oxygen or photolysis of SO3 /ozone mixtures. The favoured structure is :


Colourless polymeric condensates are formed in the reaction of gaseous SO3 or SO2 with O2 in a silent electric discharge. The structure of the polymers is based on β-SO3 ( one of the three forms of solid SO3) with oxide bridges (−O−) replaced randomly by peroxide bridges(−O−O−). As such these compounds are non-stoichiometric.

Footnotes

*Greenwood&Earnshaw


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