Crystal and molecular structures of spiro-bis(trithiastannocane), Sn(SCH2CH2SCH2CH2S)2, and spiro-bis(oxadithiastannocane), Sn(SCH2CH2OCH2CH2S)2. Distortion of the SnS4 tetrahedral coordination produced by transannular Sn⋯X (X = S, O) interactions

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