Abstract

The anionic sublattice of N(C2H5)4SbCl4 consists of isolated Sb4Cl4- 16 units built of four SbCl3- 6 distorted octahedra. There are two crystallographically inequivalent disordered tetraethylammonium cations in crystal structure. The disorder is realized by presence of two positions for all methylene carbon atoms. N(C2H5)4SbCl4 has at 298 K orthorhombic Fddd space group with a = 12.824 (3), b = 24.050 (4), c = 39.739 (4) Å, V = 12256 Å3, Z = 32. Refinement of the atomic parameters by the least square methods gave R = 0.040, wR = 0.036 for 1830 independent reflections with F > 4[sgrave](F). Temperature dependencies of lattice parameters between 170 K and 310 K were determined. The presence of the phase transition of first order at Tc = 272 K was confirmed. The broadening and then splitting of the reflections below 272 K was observed which indicates that this transition take place to phase of lower than orthorhombic symmetry.

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