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Crystal architecture and thermal decomposition of two new organically templated cadmium sulfates

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Abstract

Two organic-inorganic hybrid compounds (C5H14N2)[Cd(H2O)6](SO4)2 (I) and R-(C5H14N2)×[Cd(H2O)6](SO4)2 (II) are synthesized by the slow evaporation method and characterized by single crystal X-ray diffraction, thermogravimetry, temperature-dependent X-ray diffraction, and infrared spectroscopy. The first compound crystallizes in the centrosymmetric space group P21/n with the following unit cell parameters: a = 6.6208(2) Å, b = 10.6963(3) Å, c = 12.9318(4) Å, V = 893.05(6) Å3, and Z = 2. Its structure is solved by direct methods and refined by the least-squares analysis [R 1 = 0.0389 and wR 2 = 0.0821]. This compound shows a crystallographic disorder II destroys the inversion symmetry and leads to a fully ordered structure. Indeed, compound II crystallizes in the non-centrosymmetric space group P21 with the following unit cell parameters: a = 6.6306(1) Å, b = 10.7059(2) Å, c = 12.9186(1) Å, V = 894.67(2) Å3, and Z = 2. The crystal structure of both compounds is built from isolated SO 2−4 anions, disordered 2-methylpiperazinediium, (C5H14N2)2+ in compound I or R-2-methylpiperazinediium R-(C5H14N2)2+ in compound II, and divalent metal cations surrounded by six water molecules. These different entities are connected together only by a 3D hydrogen bond network. The thermodiffractometry and the thermogravimetric analyses indicate that the decomposition of the supramolecular precursors proceeds through several stages leading to cadmuim oxide.

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Authors and Affiliations

  1. Laboratoire Physico-Chimique de l’état Solide, Département de Chimie, Faculté des Sciences de Sfax, Université de Sfax, Sfax, Tunisia

    R. Jlassi, W. Rekik, H. Naïli & T. Mhiri

  2. Sciences Chimiques de Rennes (CNRS, UMR 6226), Université de Rennes 1, Rennes Cedex, France

    T. Bataille

Authors
  1. R. Jlassi
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  2. W. Rekik
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  3. H. Naïli
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  4. T. Mhiri
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  5. T. Bataille
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Correspondence to W. Rekik.

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Original Russian Text © 2013 R. Jlassi, W. Rekik, H. Naïli, T. Mhiri, T. Bataille

The text was submitted by the authors in English. Zhurnal Strukturnoi Khimii, Vol. 54, No. 6, pp. 1092–1102, November–December, 2013

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Jlassi, R., Rekik, W., Naïli, H. et al. Crystal architecture and thermal decomposition of two new organically templated cadmium sulfates. J Struct Chem 54, 1122–1132 (2013). https://doi.org/10.1134/S0022476613060176

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  • DOI: https://doi.org/10.1134/S0022476613060176

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