CRYSTAL STRUCTURES OF TWO ENANTIOMORPHOUS 2-ETHYLPIPERAZINEDIIUM HEXAAQUACOPPER SULFATES [(R or S)-C5H14N2][Cu(H2O)6](SO4)2
F. Hajlaoui1, H. Na??li1, S. Yahyaoui1, T. Mhiri1, T. Bataille2
1 Laboratoire de l′Etat Solide, Département de Chimie, Université de Sfax
2 Sciences Chimiques de Rennes (UMR CNRS 6226), Groupe Matériaux Inorganiques: Chimie Douce et Réactivité, Université de Rennes I
houcine_naili@yahoo.com
Ключевые слова: Non-centrosymmetric, three-dimensional structure, hydrogen bonds, open framework structures
Страницы: 335-341
Аннотация
Two new non-centrosymmetric copper sulfates are synthesized under slow evaporation conditions through the use of enantiomorphically pure sources of either (R)-2-methylpiperazine or (S)-2-methylpiperazine. Both crystallize in the non-centrosymmetric P21 space group, crystal data for [(R)-C5H14N2][Cu(H2O)6](SO4)2 (I), a = 6.5276(2), b = 11.1955(3), c = 12.4559(4) Å, β = 101.196(2)°, Z = 2, V = 892.95(5) Å3 and [(S)-C5H14N2][Cu(H2O)6](SO4)2 (II), a = 6.5188(2), b = 11.1786(2), c = 12.4365(3) Å, β = 101.205(1)°, Z = 2, V = 888.99(4) Å3. The three-dimensional structure networks for these compounds consist of isolated [Cu(H2O)6]2+ and [(R)-C5H14N2]2+ or [(S)-C5H14N2]2+ cations and anions linked only by hydrogen bonds. The Cu atom is in a slightly distorted octahedral coordination environment. The crystal packings are influenced by cation-to-anion N-H…O and OW-H…O hydrogen bonds leading to an open framework structures.
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