A novel form of molybdenum (V) phosphate:δ-KMo2P3O13

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Abstract
A new form of molybdenum (V) phosphate has been isolated. The structure of this oxide has been determined from a single crystal X-ray diffraction study. It crystallizes in the triclinic space group P [unk] with a = 8.846(8) Å, b = 8.846(9) Å, c = 10.01(1) Å, α = 56.488(8)°, β = 55.588(7), γ = 68.868(7)°, Z = 1. The refinement has led to R = 0.022 and Rw = 0.026 for 5243 reflections with I ⩾ 3 σ ( I ). The structure consists of corner-sharing MoO 6 octahedra, P 2 O 7 tetrahedra forming tunnels running along [0[unk]1] where the K + ions are located. One original feature of this structure, compared to the other forms – α , β , γ – deals with the existence of Mo 2 P 2 O 15 units formed of one P 2 O 7 group sharing four of its corners with two MoO 6 octahedra.