The azide and the isocyanate anions are isoelectronic
Several authors ,  and  reported that NCO− species are intermediates in the selective catalytic NVP-BHG712 of NOx with hydrocarbons. The isocyanates are thermally stable and hardly interact with NO or O2 alone. However, these species disappear in mixtures of the two gases with the formation of dinitrogen  and . Here we found a very similar behavior of the surface azides. They are thermally stable (decompose above 573 K) and practically does not interact with NO (at low equilibrium pressure) or O2 at ambient temperature.