Abstract
In the crystal structure of N-cyano- N-prop-2-ynyl-aniline, the propynyl group does not form the expected dominant intermolecular interaction, but only a very long and distorted contact to the cyano acceptor. Despite the long H⋯N separation of 2.75 Å, the infrared absorption spectrum indicates weakly hydrogen bonding nature of this contact. A short database analysis on hydrogen bonds from terminal alkynes to N acceptors is also performed, showing that the hydrogen bond in the title compound is the longest of this kind observed as yet.
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