Structure cristalline du tétramétaphosphate de nickel-ammonium heptahydraté: Ni(NH4)2P4O12 · 7H2O |
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Authors: | A Jouini M Dabbabi A Durif |
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Institution: | Laboratoire de chimie minérale, Département de chimie, Faculté des Sciences et Techniques de Monastir, 5000, Monastir, Tunisie, France;Laboratoire de cristallographie, Centre National de la Recherche Scientifique, Laboratoire associéà l''Université Scientifique et Médicale de Grenoble, B.P. 166 X 38042 Grenoble, Cédex, France |
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Abstract: | Nickel-ammonium tetrametaphosphate, Ni(NH4)2P4O12 · 7H2O is triclinic with a = 13.841(3); b = 9.621(5); c = 7.482(2)Å; α = 98.05(4); β = 97.25(4); γ = 103.01(4)°; M = 536.59; V = 947.9Å3; Z = 2; Dx = 1.879 g cm?3; μ = 14.524 cm?1, and space group . The crystal structure was solved using 1661 independent reflections measured on a single-crystal diffractometer (MoKα). The final R value is 0.056. The two crystallographic independent nickel atoms Ni(1) and Ni(2) are octahedrally coordinated: Ni(1) by four oxygen atoms and two water molecules, Ni(2) by six water molecules. Ni(1), closely connected to two P4O12 rings, forms a complex anion Ni(P4O12)2(H2O)2]6? which is associated to ammonium polyhedra and Ni(H2O)6]2+ octahedra. Another interesting feature of this atomic arrangement is the presence of a large channel (10 × 4) Å2 parallel to the axis. The internal surface of this channel is covered by six zeolitic water molecules. |
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