Ab initio [MP2(fu)/6-311++G**] and DFT (B3LYP/6-311++G**) calculations predict that the cyclic 1:1 complexes of formic acid with pyrrole or imidazole are stabilised by non-conventional double hydrogen σ- and π-bonds.
Double π- and σ-hydrogen bonding in formic acid complexes with pyrrole and imidazole: an ab initio and density functional theory study
R. M. Minyaev, V. I. Minkin, T. N. Gribanova and A. G. Starikov, Mendeleev Commun., 2003, 13, 207 DOI: 10.1070/MC2003v013n05ABEH001820
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