1-(2Aminoethyl) pyrrolidinium tetrachlorocobaltat (C 6 H 16 N 2 ) CoCl 4 has been prepared and analyzed by X-ray diffraction. The compound crystallizes in the orthorhombic system with space group P2 1 2 1 2 1 . The unit cell dimensions are a = 7.3279(13), b = 13.051(2) and c = 13.831(2)Å with Z = 4. The crystal structure of this salt was solved by Patterson methods and refined by full-matrix least squares on F 2 to the final values of R = 0.0486 and wR= 0.1347. The structure consists of diprotonated 1-(2aminoethyl) pyrrolidinium cations and monomeric CoCl 2− 4 These entities are interconnected by means of hydrogen bonding contacts forming a threedimensional network. Magnetization was used to investigate the magnetic properties. This compound exhibits an antiferromagnetic (AFM) to paramagnetic (PM) phase transition at a temperature (T N ) lower than 2 K. The values of paramagnetic Curie-Weiss temperature (θ cw ) and the exchange parameter (J /K B ) emphasize the existence of an antiferromagnetic interaction between the neighboring cobalt ions.
A novel semi-organic hybrid material, (C 5 H 18 N 3 ) 2 Hg 2 Cl 8 ÁHgCl 4 , was synthesized, and its structure was determined at room temperature in the noncentrosymmetric monoclinic space group P2 1 2 1 2 1 with the following parameters: a = 21.0921(7), b = 11.7288(4), c = 12.6801(5) Å , Z = 4. Its crystal structure was determined and refined down to R = 0.0549 and Rw = 0.1303. The examination of the structure shows a layer arrangement parallel to the b axis: the anionic layer may be considered as a succession of layers built up distorted triangular bipyramid [HgCl 3 ] -. The crystal packing is governed by means of the ionic N-H…Cl hydrogen bonds, forming a three dimensional network. DSC measurement reveals a transition at T = 418 K and dielectric measurements were performed to discuss the mechanism of the phase transition. The evolution of dielectric constant as a function of temperature of single crystal has been investigated in order to determine some related parameters.
Synthesis, crystal structure, vibrational study and magnetic properties of the compound (C 7 H 18 N 2 ) CuCl 4 are reported. The latter crystallizes in the monoclinic system (space group P2 1 , Z = 4) with the following unit cell dimensions: a = 7.569(5)Å b = 14.174(5)Å, c = 13.193(2)Å and β = 105.53(3) • . Besides, its structure was solved using 5754 independent reflections down to R = 0.0475. The atomic arrangement can be described by alternating organic and inorganic layers stacked in the [101] direction, made up of tetrahedral of tetrachlorocuprate CuCl 2− 4 sandwiched between two organic layers. In crystal structure, the inorganic layer, built up by independent monomeric [CuCl 4 ] 2− , is connected to the organic ones through hydrogen bonding in order to build a threedimensional network. The magnetic behavior of (C 7 H 18 N 2 ) CuCl 4 samples was investigated as a function of temperature and applied field. At hightemperature paramagnetic behavior, and at low temperature, evidence for weak ferromagnetism, reinforced by a hysteresis loop at 2 K is F. Issaoui issawi fatma@yahoo.fr observed. The magnetic behavior of (C 7 H 18 N 2 ) CuCl 4 is attributed to Cu (II) due to the presence of an active JahnTeller effect in the d 9 electronic system, which give rise to short-range weak ferromagnetism.
Synthesis and crystal structure of 3-3'-diamino-N-methyldipropylammonuim hexachlorobismuthate (III) are reported. The compound crystallizes in the triclinic system with space group P1. The unit cell dimensions are: a = 7.5580(5), b =7.8710(6), c = 8.3709(7) Å with Z=1. The crystal is built up of separated [BiCl6] 3-octahedral anions and 3-3'-diamino-N-methyldipropylammonium cations. The organic layers are arranged in sandwich between the anionic ones. The crystal packing is governed by means of the ionic N-H···Cl hydrogen bonds, forming a three dimensional network.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.