Abstract
New crystals of the family of alkylammonium chloroantimonates(V), [N(CH 3) 4]SbCl 6 and [N(C 2H 5) 4]SbCl 6, have been grown and systematically studied. X-ray studies show that [N(C 2H 5) 4]SbCl 6 is composed of isolated cations and ideal SbCl 6 − octahedra. Differential scanning calorimetry, dilatometric and dielectric measurements reveal structural phase transitions in [N(CH 3) 4]SbCl 6 and [N(C 2H 5) 4]SbCl 6 of first order at 236 and 345 K, respectively. The measurements of 1H-NMR spin-lattice relaxation times, T 1, show that mechanism of the phase transitions in [N(CH 3) 4]SbCl 6 and [N(C 2H 5) 4]SbCl 6 is due to the reorientations of the tetraalkylammonium cations.
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