[Zn(H2PO4)4] clusters and ∞[Zn2(HPO4)3(H2PO4)2] layers in two new zinc phosphates templated by [H2(4-amino-2.2.6.6-tetramethylpiperidine)] cations |
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| Authors: | A. Dakhlaoui M. Leblanc |
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| Affiliation: | a Unité de recherche 99/UR12-30, Département de Chimie, Faculté des Sciences de Bizerte, 7021 Jarzouna, Tunisie
b Laboratoire des Oxydes et Fluorures, UMR CNRS 6010, Faculté des Sciences et Techniques, Université du Maine, 72085 Le Mans Cedex 9, France |
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| Abstract: | Two zinc phosphates (ZnPO), [H2(N2C9H20)]·[Zn(H2PO4)4] (I) and [H2(N2C9H20)]2·[Zn2(HPO4)3(H2PO4)2]·H2O (II), are synthesized under hydrothermal conditions using 4-amino-2.2.6.6-tetramethylpiperidine as organic template. I crystallizes in  space group with  ,  ,  , α=92.57(1)°, β=89.76(1)°, γ=102.16(2)°,  and Z=2. Its structure, refined to R=0.029 and Rw=0.076 for 4279 independent reflections, consists of [Zn(H2PO4)4]2− clusters held together through strong hydrogen bonds to form pseudo-layers between which the doubly protonated amine molecules are inserted. II is monoclinic, C2, with  ,  ,  , β=103.72(5)°,  and Z=4 (R=0.079, Rw=0.268, 2477 independent reflections). The structure of II consists of ∞[Zn2(HPO4)3(H2PO4)2]4− inorganic (2D) layers built up from vertex-sharing [ZnO4] and [(H2/H)PO4] tetrahedra. Organic cations and water molecules ensure the connection between these layers via hydrogen bonds. It is shown that numerous (1D), (2D), e.g., [H2(N2C9H20)]2·[Zn2(HPO4)3(H2PO4)2]·H2O, and (3D) (ZnPO) result from the condensation of the [Zn(H2PO4)4]2− clusters. |
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| Keywords: | Hydrothermal synthesis Amine Zinc phosphates Crystal structure |
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