Hydrothermal Synthesis and Structural Characterization of Two Layered Mixed-Valence Vanadyl Phosphate Hydrates Na0.50VOPO4·2.0H2O and K0.50VOPO4·1.5H2O

S. L. Wang, H. Y. Kang, C. Y. Cheng, K. H. Lii

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Abstract

The single crystals of two mixed-valence vanadium phosphates A0.50VOPO4·xH2O (A = Na, x = 2.0; A = K, x = 1.5) were grown hydrothermally. Their structures were characterized by single-crystal X-ray diffraction and thermogravimetric analysis. For Na0.50VOPO4·,2.0H2O, triclinic, [formula omited], a = 6.2851 (7) Å, b = 6.284 (1) Å, c = 13.262 (2) Å, α = 80.30 (1)°, β = 87.434 (9)°, γ = 89.94 (1)°, V = 515.7 (1) Å3, Z = 4, and R = 0.0351, Rw = 0.0480 for 2413 unique reflections. For K0.50VOPO4·1.5H2O, triclinic, [formula omited], a = 6.282 (2) Å, b = 6.285 (1) Å, c = 6.679 (2) Å, α = 89.11 (2)°, β = 72.84 (2)°, γ = 89.98 (2)°, V = 251.9 (1) Å3, Z = 2, and R = 0.0309, Rw = 0.0369 for 1030 unique reflections. Both structures contain layers of distorted vanadium octahedra and phosphate tetrahedra with the water molecules and alkali-metal cations between the layers. The layer is a 4-connected net in which corner-sharing vanadium and phosphorus polyhedra alternate. These two structures are discussed along with the parent VOPO4·2H2O.

Original languageEnglish
Pages (from-to)3496-3499
Number of pages4
JournalInorganic Chemistry
Volume30
Issue number18
DOIs
StatePublished - 1 Sep 1991

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