Synthesis, crystal structure, and dielectric properties of [C 6 H 4 (NH 3 ) 2 ] 2 ClBiCl 6 .H 2 O are reported. The compound crystallizes in the monoclinic system with space group P2 1 /n. The unit cell dimensions are a=9.836(5), b=19.582(5), c=13.082(5) Å, β=104.731(5)°with Z=4. The atomic arrangement can be described by an alternation of organic and inorganic layers. The anionic layer is built up of octahedral of [BiCl 6 ] 3-arranged in sandwich between the organic layers. The crystal packing is governed by means of the ionic N-H···Cl hydrogen bonds, forming a threedimensional network. The dielectric properties have been investigated at temperature range from 297 to 410 K at various frequencies (10 Hz-100 kHz). Dielectric studies were performed to confirm results obtained with thermal analysis. The evolution of dielectric constant as a function of temperature and frequency of single crystal has been investigated in order to determine some related parameters.
The chemistry of bismuth(III) halides has been explored for several decades owing to the strong tendency of bismuth to act as a halide ion acceptor. 1 Consequently, numerous complex haloanions of bismuth have been formed with a variety of cations, and most of them are constituted by polynuclear anions with different polymerization geometries, where the basic MX6 octahedra share corners, edges, and faces. [2][3][4] In these compounds the metal shows a tendency toward distorted octahedral coordination with observable differences in the Bi-X bond lengths and Bi-X-Bi angles from the mean values characteristics of non-deformed polyhedra. This distortion was associated with a shift of the lone electron pair of Bi(III) in the direction of the interaction forming an aspherical distribution around the Bi(III) centre. In this paper, we describe the chemical preparation and crystal structure of methoxyphenylammonium pentachlorobism uthate(III).Deep-purple crystals of [C6H4OCH3NH3]2 BiCl5 were synthesized by the addition of methoxyphenylamine to a solution of bismuth (III) nitrate (molar ratio 2/1) in concentrated hydrochloric acid (36%). Single crystals were grown by the slow evaporation of an aqueous solution at room temperature. Chemical analyses of bismuth atoms and chloride anions were carried out.The experimental conditions used for single-crystal data collections are given in Table 1. The positional parameters for the bismuth atoms were obtained from a three-dimensional Patterson map, while the remaining atoms were found from a successive difference Fourier map. After introducing anisotropic thermal displacement parameters for the non-hydrogen atoms, the hydrogen atoms were localized and optimized to fixed positions. Their contributions were isotropically introduced into the calculation, but not refined. The final anisotropic full-matrix least squares resulted in the convergence of the R factor to 0.0365 (Rw = 0.0851), incorporating the weighting scheme w = 1/[s 2 (Fo 2 ) + (0.0538P) 2 ], where P = Max[(Fo 2 ,0) + 2Fc 2 ]/3.The asymmetric unit of the title compound ( Fig. 1)
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