TO THE KNOWLEDGE OF CIS-SODIUM HYPONITRIT E

Surprisingly, cis-sodium hyponitrite can be prepared by reacting gaseo us N2O and solid Na2O. For the first time, the structure of a simple s alt of cis hyponitrous acid has been determinated unambigously. Accord ing to an abinitio structure determination based on powder data, cis-N a2N2O2 crystallizes monoclinic (P2(1)/c, a=5.107(1); b=9.211(1); c=6.1 59(1) Angstrom; beta=97.91(1)degrees; Z=4). Results of spectroscopic i nvestigations (vibrational spectroscopy, N-15-MAS-NMR) agree with the symmetry of the cis-N2O22- anion ion as it has been proved by the crys tal structure. Considerable differences regarding some chemical and ph ysical properties have been observed for samples of cis-Na2N2O2 synthe sized via different routes.