No abstract

The result of the X-ray diffraction, differential scanning calorimetry and dielectric studies on a new crystal material C 6 H 18 N 2 SbCl 5 is presented. The new organic-inorganic compound has been synthesized and characterized by the X-ray diffraction method at 296(2) K. It crystallizes in the monoclinic P21/n space group. The cell dimensions are: a = 5.8617(1) Å, b = 15.7069(2) Å, c = 16.6693(2) Å, β = 97.627(1)°and Z = 4. The crystal structure consists of a discrete ionic layer of (C 6 H 18 N 2 ) 2+ cations and [SbCl 5 ] 2À anions linked via simple and bifurcated N-H · · · Cl hydrogen bonds. DSC analysis shows that this compound undergoes a phase transition at about (384 ± 2) K. AC and DC conductivities, complex dielectric permittivity ε* (ω) and complex electrical modulus M*(ω) were respectively studied as temperature and frequency functions. The combined data support each other and confirm the existence of a structural phase transition at about 384 K. Moreover, the temperature dependence of the DC conductivity and relaxation frequency followed the Arrhenius relation. The frequency dependence of the real part of the AC conductivity in both phases follows the Jonscher's universal dynamic law:The behavior of s(T) with temperature suggests that the hopping over barrier model (CBH) and the small polaron tunneling mechanism (SPTM) prevail in phases I and II, respectively.

In the title compound, (C8H12N)3[Sb2Br9], two of the three unique N,N-dimethyanilinium cations exhibit flip–flop disorder with an occupancy ratio of 0.58 (1):0.42 (1). N—H⋯Br hydrogen bonds link the organic cations and bioctahedral face-sharing anions into a three-dimensional network.

The asymmetric unit of the title compound {(C6H18N2)2[Sb2Br10]·H2O}n, consists of two tetra­methyl­ethylendi­ammonium cations that are located on centres of inversion, as well as one tetra­methyl­ethylendi­ammonium cation, one water mol­ecule, one distorted octahedral [SbBr6]3−anion and one bisphenoidal [SbBr4]− anion in general positions. The [SbBr6]3− and [SbBr4]− anions are linked together by two long Sb—Br bonds of 3.2709 (8) and 3.5447 (7) Å into {[Sb2Br10]4−}n chains along [001]. One of the three tetra­methyl­ethylendi­ammonium cations is disordered and was refined using a split model (occupancy ratio 0.58:0.42). The cations and the water mol­ecule are connected to the {[Sb2Br10]4−}n polymeric anions by weak N—H ⋯Br and O(water)—H ⋯Br hydrogen bonding.