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  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen an Tetranatrium-cyclo-tetraphosphat(V) und seinen Hydraten (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 699-709 
    Details
    ISSN: 1434-4475
    Keywords: Anhydrous sodium-cyclo-tetraphosphate(V) ; Crystal-structure ; Sodium-cyclo-tetraphosphate(V)-monohydrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A reinvestigation of the system (NaPo3)4/H2O has been carried out. Besides the already known tetra-hydrate and anhydrous form, a mono-hydrate in the temperature range 100–120°C exists. Single crystals were obtained by crystallization from aqueous solutions containing higher alcohols (e.g. ethyleneglycol) at ∼115°C. The crystal structure was solved by X-ray methods (orthorhombic;P212121;a=1365.4(2),b=1 347.5(3),c=629.1(3)pm;Z=4; 2774 diffractometer data;R=0.053). The cyclic anions exhibit point symmetryD 2d with all terminal oxygens in eclipsed conformation. With respect to the (NaPO3)4-part of structure, mono-hydrate and anhydrous forms are isostructural; lattice parameters of the latter area=1 380.8(2),b=1 363.3(2),c=602.7(2) pm. The transition mono-hydrate to anhydrous form occurs topochemically and is reversible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01134183
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  • 2
    Electronic Resource
    Electronic Resource
    Kristallstruktur und thermisches Verhalten von Tetrakaliumcyclo-tetraphosphat(V)-Dihydrat, (KPO3)4·2H2O (1985)
    Springer
    Monatshefte für Chemie 116 (1985), S. 203-210 
    Details
    ISSN: 1434-4475
    Keywords: Potassium-cyclo-tetraphosphate(V)-dihydrate ; Crystal structure ; Dehydration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798455
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