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  • Author: U. Schülke x
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Abstract

[C(NH2)3]10P10O30 · 4 H2O is the first organic-cation cyclodecaphosphate elaborated and structurally charaterized by single-crystal X-ray diffraction methods. It crystallizes in the triclinic system, P[unk], with Z = 1 and the following unit-cell dimensions: a = 12.192(8) Å, b = 14.083(9) Å, c = 9.317(6) Å, α = 91.25(3)°, β = 103.61(3)°, γ = 71.22(2)°.

The crystal structure was solved using 8862 unique reflections with a final R value of 0.032. The centrosymmetrical P10O30 rings are interconnected through the organic entities and the water molecules by a very intricated network of strong hydrogen bonds. The high stability of the title compound can probably be explained by the strength and the large number of these hydrogen bonds and by its low hydration state.

Abstract

Te(OH)6 · K8P8O24 · 2 H2O is the first example of an adduct between telluric acid and a cyclooctaphosphate. We report its chemical preparation and its atomic arrangement. The title compound is triclinic P[unk], Z = 1 with the following unit cell dimensions: a = 11.315(9), b = 10.67(1), c = 7.547(3) Å α = 108.72(5), β = 100.30(2), γ = 66.80(5)°

Crystal structure was determined and refined to final R = 0.028 for 7265 independent reflections. The atomic arrangement is mainly characterized by the coexistence of independent units of [P8O24]8− ring anions and of Te(OH)6 groups, both centrosymmetric.

The hydrogen bond scheme is described. In addition, the internal symmetries and the geometries of the rare [P8O24]8− ring anions presently investigated are discussed.