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Reaction of caesium 4-benzoyl-1,3-dithiole-2-thione-5-thiolate with iodine produced bis(4-benzoylthio-1,3-dithiole2-thione)-5,5′-disulfide,  6 . Compound,  6  has been obtained in two crystalline forms, on recrytsallisation from different organic solvent systems, designated  6X  with space group  P 2 1 / c  and  6Y  with space group  P 2 1 . Two enantiomers of the molecule of  6  are observed but both polymorphs are racemates,  6X  because of the centrosymmetric space group  P 2 1 / c  and  6Y  because of the presence of both enantiomers in the bimolecular asymmetric unit. The polymorphs differ in molecular packing, the resulting intermolecular contacts and the disposition of the enantiomers. In  6X  the enantiomers are found in separate stacks of face to face molecules which combine to create channels containing intermolecular C–H · · · O hydrogen-bonds along with π · · · π overlap of rings within and between the stacks. In  6Y  the enantiomers are found in separate chains with intermolecular C–H · · · S hydrogen-bonds providing connnectivity within and between the chains and, overall, two-dimensional connectivity in well defined layers of molecules. Stacking of the layers creates stacks of face to face molecules similar to, but less regular than those observed in  6X , in which the enantiomers alternate along the length of the stack.

Two polymorphs of bis(4-benzoylthio-1,3-dithiole-2-thione)-5,5′-disulphide