The title compounds, 2-(pyridin-2-yl)-1-perimidine (CHN; ), 1-methyl-2-(pyridin-2-yl)-1-perimidine (CHN; ), and 1,3-dimethyl-2-(pyridin-2-yl)-1-perimidinium iodide (CHN ·I; ) were synthesized under mild conditions and their structures were determined by H NMR spectroscopy and single-crystal X-ray analysis. The -methyl-ation of the nitro-gen atom() at the perimidine moiety results in a significant increase of the inter-plane angle between the pyridin-2-yl ring and the perimidine system. The unsubstituted perimidine () forms a weak intra-molecular N-H⋯N bond that consolidates the mol-ecular conformation. In the crystal structures of -, the mol-ecular entities all are assembled through π-π and C-H⋯π inter-actions.
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| http://dx.doi.org/10.1107/S205698902100013X | DOI Listing |
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