4-Cyano-1-methylpyridinium nitrate

The title molecular salt, C7H7N2+·NO3−, displays an interpenetrating sheet structure parallel to a with each sheet containing nearly coplanar cations and anions, each ion being bisected by a crystallographic mirror plane. C—H...O hydrogen bonds involving both ring and methyl H atoms in addition to cation–cation C—H...N hydrogen bonds (ring H to cyano N) serve to link the sheets together. In each set of parallel layers, the cations and anions stack with short distances of 3.094 (2) (between aligned nitrate N and pyridine N atoms) and 3.057 (2) Å (between a nitrate O atom and the ring centroid). This motif is strikingly similar to the one that features in the isomeric salt 2-cyano-1-methylpyridinium nitrate.

Abstract licence: CC BY

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