Darstellung,Kristallstruktur und Eigenschaften von Cäsiumozonid

Synthesis, Crystal Structure and Properties of Cesium Ozonide By reaction between CsO₂ and mixtures of O₂ and O₃ in the temperature range from 25°C to ?70°C and subsequent extraction with liquid ammonia pure CsO₃ was obtained in grammeamounts. By X-ray powder and thermal techniques a reversible, structural phase transition was detected at +8°C, and decomposition into CsO₂ and O₂ at +53°C. The low-temperature form (T? CsO₃) is isostructural to RbO₃ (P2₁/c; a = 675.1(2), c = 901.5(3) pm, β = 120.74(3)°l Z = 4), the crystal structure of H? CsO₃, which shows orientational disorder with respect to the ozonide ion, corresponds to the CsCl-type of structure (a = 436.06(3) pm). Using the geometry as determined for KO₃ and RbO₃, and the vibrational frequencies of different isotopomeres, the force constants of O₃^? have been redetermined.