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The crystal structure of [1-(2-aminoethyl) piperazinium] choride trachloridocobaltate (II): [C 6 H 18 N 3 ] ClCoCl 4 has been synthesized and analyzed by X-ray diffraction. Magnetization was used to investigate the magnetic properties. The salt crystallizes at room temperature in the monoclinic system with space group P2 1 , the unit cell dimensions are: a = 7.2113 Å, b = 12.4844 Å, c = 8.0554 Å, β = 97.274 • with Z = 2. The crystal structure of this salt was solved by Patterson methods and refined by full-matrix least squares on F 2 to final values of R = 0.0361 and wR = 0.0701. The structure consists of monomeric triprotonated [1-(2-aminoethyl) piperazinium] cations, monomeric CoCl 2− 4 and Cl − anions. These entities are interconnected by means of hydrogen bonding contacts forming a threedimensional network. The magnetic measurements experimentally show a deviation from the Curie-Weiss law at low temperatures, which reveals the occurrence of weak ferromagnetism at low temperature. The measurements of isothermal magnetics at low temperature show a weak hysteresis, which was confirmed by the small coercive field found at low temperature. In addition, self-consistent ab initio calculations, based on FLAPW method (Wien2k code), are performed to investigate magnetic, electronic properties and crystal structure, of [1-(2-aminoethyl) piperazinium] choride trachloridocobaltate(II). Spins polarized within the framework of the Coherent Potential Approximation (CPA) are considered.

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Several studies have been made in the solid state on complexes between bismuth(III) and bromide or iodide; however, only few complexes of bismuth(III) chlorides with organic cations have been investigated. The alkylammonium halogenobismuthates(III) can form a variety of polychlorinated anions, including (BiCl4 . These compounds are interesting because they exhibit ferroparaelectric phase transitions related to the motions of the ammonium cations. Taking these considerations into account, we report on the synthesis and crystal structure of tris(2-aminoindolinium)hexachlorobismuthate(III) monohydrateThe crystals of the title compound were obtained by dissolving in a concentrated HCl (36%) solution a stoichiometric mixture of 2-amino-indolinium C8H8N2 and BiCl3 (molar ratio 3/1). The resulting aqueous solution was then kept at room temperature. After several weeks of evaporation, parallelepiped-shaped monocrystals appeared in the solution.A single-crystal study was performed by using an EnrafNonius Kappa CCD diffractometer. The main crystal data and a summary of the parameters related to intensity data collection and structure refinement are reported in Table 1. The positional parameters for the bismuthate atoms were obtained from a threedimensional Patterson map, while the remaining atoms were found from successive difference Fourier maps. After introducing thermal displacement parameters for the nonhydrogen atoms, the hydrogen atoms were localized and optimized to restraint positions. Their thermal displacement contributions were isotropically introduced into the calculation and fixed. Corrections were applied for Lorentz and polarization effects and for absorptions. The final anisotropic full-matrix least squares resulted in a convergence of the R factor at 0.

In the title compound, [CuCl3(C6H16N3)]·H2O, the copper(II) ion is five-coordinated by two N atoms from the bidentate 4-(2-amino­ethyl)piperazin-1-ium cation and three chloride ions in a distorted square-pyramidal environment. Inter­molecular N—H⋯Cl and O—H⋯Cl hydrogen bonds build up an intricate three-dimensional network.