Neutron diffraction studies provide evidence for the existence of the hydrogen diquinuclidinone homoconjugated cation containing a very short and symmetrical linear N–H–N hydrogen bond [N ⋯ N = 2.635(2)Å and N–H = 1.317 (1)Å].
J. Roziere, C. Belin and M. S. Lehman, J. Chem. Soc., Chem. Commun., 1982, 388 DOI: 10.1039/C39820000388
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