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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.


Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4. 

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Higher_sulfur_oxides". A list of authors is available in Wikipedia.
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