Adsorption of gaseous NO on the acidic surface Brønsted centers of the strongest known solid acid, H(CHBF), results in formation of the N≡N-OH cation. Its positive charge is localized mainly to the H-atom, which is H-bonded to the CHBF anion forming an asymmetric proton disolvate of the L-HL type, where L = NO and L = CHBF. NO protonation under the same conditions leads to the formation of the highly reactive cation radical NOH˙, which reacts rapidly with an NO molecule according to the equation NOH + NO → [NOH] → NOH + O resulting in the formation of two types of NOH cations: (i) a typical Brønsted superacid, N[triple bond, length as m-dash]N-OH, with a strongly acidic OH group involved in a rather strong H-bond with the anion, and (ii) a typical strong Lewis acid, N[triple bond, length as m-dash]N-OH, with a positive charge localized to the central N atom and ionic interactions with the surrounding anions via the charged central N atom.
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