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Summary of the 1H and 15N NMR chemical shifts (green), N-H bond lengths (red), and crystallographically determined N---N distances (blue) of the three DMAN salts. DMAN*HClO4 shows the most delocalized HN or the strongest H-bond, the largest 1H chemical shift and equivalent 15N chemical shifts. The two DMAN salts with bulky organic counter anions have different RNH’s, inequivalent 15N chemical shifts, and smaller 1H chemical shifts.
