In
gas phase sulphur atom of SO3 has sp2 hybridized and
trigonal structure. In which three sigma bond give rise to trigonal planer
shape and
three delocalized π-bond, out of three π-bond one is pπ-pπ bond and another two are pπ-dπ bond.
In
solid phase SO3 exist at room temperature and have two different structures.
Important fact that
cyclic trimer of SO3 (S3O9)
is also isoelectronic with P3O9-3 and contains 120
electrons.
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