The crystal structure of (benzimidazole2H)+ BF4– has been shown to contain a long N–N hydrogen bond [2·787(4)Å] with the proton in an asymmetric single minium; this is consistent with the vibrational spectrum, which also indicates a similar potential in solution.
A. Quick, D. J. Williams, B. Borah and J. L. Wood, J. Chem. Soc., Chem. Commun., 1974, 891 DOI: 10.1039/C39740000891
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