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The asymmetric unit of the title compound, NH(4) (+)·CF(2)NO(4)S(2) (-), consists of two crystallographically independent ammonium cations and two 4,4-difluoro-1,3,2-dithia-zetin-2-ide 1,1,3,3-tetra-oxide anions all located in general positions. The S-C-S-N rings of both crystallographically independent anions are almost planar, with the N atom bent out of the plane by 9.82 (5) and 12.82 (4)°. The structure was determined from a crystal twinned by inversion, with refined components in the ratio 0.73 (4):0.27 (4). Anions and cations are connected via hydrogen bonds (N-H⋯O and N-H⋯N) to form a three-dimensional framework. This framework is composed of two different layers parallel to the ab plane, which are built by the ammonium cations on the one hand and the complex cyclic anions on the other.

Ammonium 4,4-difluoro-1,3,2-dithiazetin-2-ide 1,1,3,3-tetraoxide