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<p>A new lead tri-magnesium phosphate PbMg<sub>3</sub>(HPO<sub>4</sub>)(PO<sub>4</sub>)<sub>2</sub> was synthesized by hydrothermal method and characterized by single crystal X-ray diffraction. This phosphate crystallizes in the monoclinic system with space group <i>I</i>2<i>/m</i> and unit cell parameters <i>a</i> = 6.6403(2)Å, <i>b</i> = 13.1169(5) Å, <i>c</i> = 10.7153(4) Å and β = 90.194 (1)°. The structure consists of two edge-sharing [MgO<sub>6</sub>] octahedra linked to [PO<sub>4</sub>] or [HPO<sub>4</sub>] tetrahedra to build [Mg<sub>2</sub>P<sub>2</sub>O<sub>14</sub>] and [Mg<sub>2</sub>H<sub>2</sub>P<sub>2</sub>O<sub>14</sub>] moieties, which are interconnected together through vertices to form a sheet parallel to (1 0 0) plan. In addition, an infinite chain ([MgPO<sub>9</sub>]<sub>∞</sub>) formed by the sharing of a vertex between the [MgO<sub>6</sub>] octahedron and the [PO<sub>4</sub>] tetrahedron ensures the connection of the sheets to form a three-dimensional structure containing tunnels parallel to the <i>b</i> and <i>c</i> axes. The Pb<sup>2+</sup> and H<sup>+</sup> cations are located in disordered sites in these tunnels. The structure of this phosphate exhibits also a strong hydrogen bond.</p> Graphical Abstract <p>(A) and (C) Polyhedral representation of the structure showing the tunnels along the [010] and [001] directions that house Pb and H atoms. The dashed lines in the tunnels of (C) represent the hydrogen bond O1–H1…O1<sup>i</sup>. (B) Infinite chain [MgPO<sub>9</sub>]<sub>∞</sub> formed by alternating [MgO<sub>6</sub>] octahedra and [PO<sub>4</sub>] tetrahedra, which connect the layers stacked along the <i>c</i>-axis.</p> <p></p>

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Hydrothermal Synthesis and Structural Characterization of a New Lead Tri-magnesium Phosphate PbMg3(HPO4)(PO4)2

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Ahmed Ould Saleck,
  • Cyrille Albert-Mercier,
  • Claudine Follet-Houttemane,
  • Abderrazzak Assani,
  • Mohamed Saadi,
  • Lahcen El Ammari

摘要

A new lead tri-magnesium phosphate PbMg3(HPO4)(PO4)2 was synthesized by hydrothermal method and characterized by single crystal X-ray diffraction. This phosphate crystallizes in the monoclinic system with space group I2/m and unit cell parameters a = 6.6403(2)Å, b = 13.1169(5) Å, c = 10.7153(4) Å and β = 90.194 (1)°. The structure consists of two edge-sharing [MgO6] octahedra linked to [PO4] or [HPO4] tetrahedra to build [Mg2P2O14] and [Mg2H2P2O14] moieties, which are interconnected together through vertices to form a sheet parallel to (1 0 0) plan. In addition, an infinite chain ([MgPO9]∞) formed by the sharing of a vertex between the [MgO6] octahedron and the [PO4] tetrahedron ensures the connection of the sheets to form a three-dimensional structure containing tunnels parallel to the b and c axes. The Pb2+ and H+ cations are located in disordered sites in these tunnels. The structure of this phosphate exhibits also a strong hydrogen bond.

Graphical Abstract

(A) and (C) Polyhedral representation of the structure showing the tunnels along the [010] and [001] directions that house Pb and H atoms. The dashed lines in the tunnels of (C) represent the hydrogen bond O1–H1…O1i. (B) Infinite chain [MgPO9]∞ formed by alternating [MgO6] octahedra and [PO4] tetrahedra, which connect the layers stacked along the c-axis.