Hydrothermal Synthesis, Crystal Structure, and Magnetic Properties of a New Inorganic Vanadium(III) Phosphate with a Chain Structure

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• 作者：Stanislav Ferdov ; Mario S. Reis ; Zhi Lin ; Rute A. Sá ; Ferreira
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：November 3, 2008
• 年：2008
• 卷：47
• 期：21
• 页码：10062-10066
• 全文大小：245K
• 年卷期：v.47,no.21(November 3, 2008)
• ISSN：1520-510X

文摘

A new vanadium(III) phosphate, Na₃V(OH)(HPO₄)(PO₄), has been synthesized by using mild hydrothermal conditions under autogeneous pressure. This material represents a very rare example of sodium vanadium(III) phosphate with a chain structure. The crystal structure has been determined by refinement of powder X-ray diffraction data, starting from the atomic coordinates of an isotypic compound, Na₃Al(OH)(HPO₄)(PO₄), which was obtained under high temperature and high pressure. The phase crystallizes in monoclinic space group C2/m (No. 12) with lattice parameters a = 15.423(9) Å, b = 7.280(0) Å, c = 7.070(9) Å, β = 96.79(7)°, V = 788.3(9) ų, and Z = 4. The structure consists of one-dimensional chains composed of corner-sharing VO₅(OH) octahedra running along the b direction. They are decorated by isolated PO₄ and HPO₄ tetrahedra sharing two of their corners with the ones of the vanadium octahedra. The interconnection between the chains is assured by three crystallographically distinct Na⁺ cations. Magnetic investigation confirms the 3+ oxidation state of the vanadium ions and reveals an antiferromagnetic arrangement between those ions through the chain.