A statistical analysis of halide · · · H–A (A = OR, NR2, N+R3) hydrogen bonding interactions in the solid state

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Mark Mascal


Abstract

The interaction between F, Cl, Br and I and organic H-bond donors OH, NH and N+H are examined in detail using the Cambridge Structural Database. The ammonium group is shown to be the most effective H-bond donor to the halides, followed by the hydroxy group and neutral NH. Comparison of the H-bonding requirements of the anions in each case shows trends in X · · · HA distances (r), with the Δr interval between F and Cl being the greatest, and that between Cl and Br the least. Mean H-bonding angles ∠AHX are ca. 160 ° and tend towards greater linearity with increasing quality of the hydrogen bond. Interactions of halide ions with macrocyclic H-bonding receptors and the potential for host selectivity are discussed.


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