A determination of the stabilities of N+2(N2)n and O+2(N2)n with n=1–11 from measurements of the gas-phase ion equilibria

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Abstract
The gas‐phase equilibria of solvation reactions of N+2 and O+2 ions with N2 were measured with a pulsed electron‐beam high‐pressure mass spectrometer. van’t Hoff plots of the equilibrium constants lead to the determination of the thermochemical stabilities for N+2(N2)n and O+2(N2)n clusters with n=1–11. While a covalent bond was formed in the cluster N+2⋅⋅⋅N2, the interaction is largely electrostatic for ligands in the clusters N+2(N2)n with n=2–11. The decrease in the −ΔH0n−1,n values of N+2(N2)n with n for n=2→11 are rather smooth, i.e., the clusters N+2(N2)n do not have any particularly stable shell structures except for n=1. On the contrary, O+2(N2)n was found to have the shell structure with n=4.