High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! 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. 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 ?-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.

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