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Bis(allylammonium)pentachloroantimonate(III) - allylammonium chloride, (C 3 H 5 NH 3 ) 2 [SbCl 5 ] · (C 3 H 5 NH 3 )Cl, belongs to the chloroantimonate(III) organic-inorganic salts family. The DSC studies of this compound showed two anomalies at 181 K and at 223 K. Both are associated with phase transitions, which mainly occur due to ordering-disordering processes of the organic cations. Between 181 and 223 K the structure is incommensurate. The crystal structure was determined at 298 and 86 K. At both temperatures the crystal structure consists of (C 3 H 5 NH 3 ) +  cations, anionic distorted [Sb 2 Cl 10 ] 4−  units and isolated Cl −  ions. In the room-temperature phase two out of three, and in the low-temperature phase two out of six allylammonium cations were found to be disordered. The deformations of the [Sb 2 Cl 10 ] 4−  moieties in both phases are discussed and explained by the deviation of the Sb III  5s electron lone pair from its spherical symmetry and the influence of N-H···Cl hydrogen bonds, which join together the organic and inorganic sublattices.

Distortions of [Sb 2 Cl 10 ] 4– Bioctahedra and Phase Transitions in the Chloroantimonate(III) (C 3 H 5 NH 3 ) 2 [SbCl 5 ] · (C 3 H 5 NH 3 )Cl