Te(OH) 6 · K 8 P 8 0 2 4 · 2 H 2 0 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 ΡΊ, Ζ = 1 with the following unit cell dimensions: a = 11.315(9), b = 10.67(1), c = 7.547(3) Â 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 [PgC^J 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 [Ρ 8 0 24 ] 8~ ring anions presently investigated are discussed.
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