Knowledge Bank

Composition of NO with the superheated vapors of chalcogens from Knudsen cells yields $S2NO$ (1771.7 and $670cm-1$) and $Se2NO(1771.1cm-1$). The chalcogen-chalcogen stretching frequencies are surprisingly close, and are less than $5cm-1$ to the low-energy side of the $(NO)2$ band. Convincing proof that the new bands belong to a new molecule (and not to a perturbed $(NO)2$ species) is provided by scrambled N-14/N-15 end O-16/O-18 experiments. Products of photolysis include the better known oxides $S2OSeO,$ and $Se2O$.