Abstract
The crystal structure of the clathrate form of syndiotactic poly(m-methylstyrene) containing carbon disulfide is presented. The structure is characterized by polymer chains in s(2/1)2 helical conformation and CS2 molecules packed in an orthorhombic unit cell with axes a = 17.8 A, b = 13.1 A, and c = 7.8 A, according to the space group Pcaa. The calculated crystalline density is 1.14 g/cm3 for two polymer chains (eight monomer units) and four carbon disulfide molecules included in the unit cell. As in the packing model proposed for the crystal structures of the β class of the syndiotactic poly(p-methylstyrene) clathrates, the guest molecules occupy cavities delimited by isomorphous helices along the b axis and are related by the crystallographic 2-fold screw axis of the unit cell. The packing of the helices along the a axis, instead, is similar to the close packing realized by the chains only in the clathrates and in the δ form of syndiotactic polystyrene.
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