Synthesis and crystal structure analysis of sodium ozonide

Solutions of sodium ozonide in ammonia have been obtained starting from ces ium ozonide via cation exchange in liquid ammonia. After addition of dimeth yl amine and removing the solvent mixture pure sodium ozonide precipitates as a bright red microcrystalline powder. According to X-ray powder data, Na O3 is isotypical with NaNO2 (I m2m; a = 3.5070(2) Angstrom, b = 5.7703(3)An gstrom, c = 5.2708(3) Angstrom; Z = 2; Rietveld profile fitting, R-Int = 3. 71%). The O-O-distances (1.353(3) Angstrom) are the longest observed so far in ionic ozonides, the angle of 113.0(2)degrees is the smallest. The frequ encies of the fundamental vibrations of the ozonide anion as obtained by In frared and Raman spectroscopy are shifted to higher wave numbers as the cat ion diameter is decreasing. Unlike the ozonides of the heavy alkalimetals N aO3 represents a magnetically strongly coupled system (mu(eff) = 1.45 mu(B) at 250 K).