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Kristallstruktur und thermisches Verhalten von Tetrakaliumcyclo-tetraphosphat(V)-Dihydrat, (KPO3)4·2H2O

Crystal structure and thermal behaviour of tetrapotassium-cyclo-tetraphosphate(V)-dihydrate, (KPO3)4·2H2O

  • Anorganische Und Physikalische Chemie
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Abstract

The crystal structure of (KPO3)4 · 2H2O was solved by direct methods andFourier-syntheses (triclinic; P\(\bar 1\);a=1 114.9 (2),b=821.9 (2),c=815.7 (3) pm; α=88,88 (2), β=84.51 (2), γ=82.70 (2)°;Z=2; 5910 unique reflections;R=0.052). The cyclic anions exhibit point symmetry S4 with four terminal oxygens in axial and four in equatorial position. Thermal investigations (DTA, TGA, X-Ray-methods) show that the dehydration occurs in two steps. The anhydrous form of (KPO3)4 is stable above 230 °C and undergoes a second order phase transition which is complete at 515±5 °C.

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Authors and Affiliations

  1. Institut für Anorganische Chemie, Universität Hannover, D-3000, Hannover 1, Bundesrepublik Deutschland

    Dietmar M. Wiench & Martin Jansen

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  1. Dietmar M. Wiench
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  2. Martin Jansen
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Wiench, D.M., Jansen, M. Kristallstruktur und thermisches Verhalten von Tetrakaliumcyclo-tetraphosphat(V)-Dihydrat, (KPO3)4·2H2O. Monatsh Chem 116, 203–210 (1985). https://doi.org/10.1007/BF00798455

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  • DOI: https://doi.org/10.1007/BF00798455

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