Synthesis, Infra-red, Raman, NMR and structural characterization by X-ray Diffraction of [C12H17N2]2CdCl4 and [C6H10N2]2Cd3Cl10 compounds

The synthesis, infra-red, Raman and NMR spectra and crystal structure of 2, 4, 4- trimethyl-4, 5- dihydro-3H-benzo[b] [1, 4] diazepin-1-ium tetrachlorocadmate, [C12H17N2]2CdCl4 and benzene-1,2-diaminium decachlorotricadmate(II) [C6H10N2]2Cd3Cl10 are reported. The [C12H17N2]2CdCl4 compound crystallizes in the triclinic system (P-1 space group) with Z = 2 and the following unit cell dimensions: a = 9.6653(8) angstrom, b = 9.9081(9) angstrom, c = 15.3737(2) angstrom, alpha = 79.486(1)degrees, beta = 88.610(8)degrees and gamma = 77.550(7)degrees. The structure was solved by using 4439 independent reflections down to R value of 0.029. In crystal structure, the tetrachlorocadmiate anion is connected to two organic cations through N-H...Cl hydrogen bonds and Van Der Waals interaction as to build cation-anion-cation cohesion. The [C6H10N2]2Cd3Cl10 crystallizes in the triclinic system (P-1 space group). The unit cell dimensions are a = 6.826 (5)angstrom, b = 9.861 (7)angstrom, c = 10.344 (3)angstrom, alpha = 103.50 (1)degrees, beta = 96.34 (4)degrees and gamma = 109.45 (3)degrees, Z=2. The final R value is 0.053 (Rw=0.128). Its crystal structure consists of organic cations and polymeric chains of [Cd3Cl10]4- anions running along the [011] direction, In The [C6H10N2]2Cd3Cl10 compounds hydrogen bond interactions between the inorganic chains and the organic cations, contribute to the crystal packing. PACS Codes: 61.10.Nz, 61.18.Fs, 78.30.-jComment: 19 pages, 10 figure

Research article Synthesis, Infra-red, Raman, NMR and structural characterization by X-ray Diffraction of [C 12 H 17 N 2] 2 CdCl 4

© 2008 Chaabane et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens

Optical, UV-Vis spectroscopy studies, electrical and dielectric properties of transition metal-based of the novel organic-inorganic hybrid (C6H10N2)(Hg2Cl5)(2 center dot)3H(2)O

International audienceIn this work, we are interested in the synthesis of new hybrid material (C6H10N2)(Hg2Cl5)(2 center dot)3H(2)O grown by hydrothermal methods. X-ray diffraction indicates that this compound crystallizes at 150(2) K in the monoclinic system with C2/c space group, with the following unit cell parameters a = 19.6830(15) angstrom, b = 18.1870(15) angstrom, c = 6.8567(6) angstrom, beta = 93.224(3)degrees and Z = 4. On the other hand, the optical properties of this compound were studied using ultraviolet-visible (UV-Vis) spectroscopy in the range 200-800 nm. Furthermore, the optical absorbances are used to determine the absorption coefficient a and the optical band gap Eg, so the Tauc model was used to determine the optical gap energy of the compound (C6H10N2)(Hg2Cl5)(2 center dot)3H(2)O. The analysis of the results revealed the existence of optical allowed indirect transition mechanisms with the band gap energy equal to (2.37 eV) for liquid and (4.33 eV) for solid. Impedance measurements indicate that the electrical and dielectric properties are strongly dependent on both temperature and frequency. Nyquist plots (Z '' versus Z') show that the conductivity behavior is accurately represented by an equivalent circuit model which consists of a series combination of bulk and grain boundary. Furthermore, the angular frequency dependence plots of the real and imaginary parts, epsilon' and epsilon '', of complex dielectric permittivity epsilon* and tan delta losses at several temperatures between 303 and 453 K were studied for the title compound. Finally, the modulus plots can be characterized by the presence of two relaxation peaks