The crystal structure and solid-state packing of 4-chloro-5-1,2,3-dithiazol-5-one and two polymorphs of 4-chloro-5-1,2,3-dithiazole-5-thione were analyzed and compared to structural data of similar systems. These five-membered S,N-rich heterocycles are planar with considerable bond localization. All three structures demonstrate tight solid-state packing without voids which is attributed to a rich network of short intermolecular electrostatic contacts.
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