For 51 terminal alkyn groups in 42 crystal structures, the correlation of displacement parameters with C–H ⋯ X hydrogen-bond distances shows that thermal vibrations are reduced due to hydrogen bonding even for long C ⋯ X separations between 3.6 and 3.8 Å and H ⋯ X separations between 2.6 and 2.8 Å.
T. Steiner, J. Chem. Soc., Chem. Commun., 1994, 101 DOI: 10.1039/C39940000101
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