Abstract
Hydroxytropenylium iodide and bromide contain normal electrostatic OH⋯X − hydrogen bonds. Hydroxytropenylium chloride, however, contains a hydrogen bond intermediate between the normal electrostatic type and the very strong covalent type, similar to the hydrogen bonds found in choline fluoride or the Type I C ∞v hydrogen dihalide ions. Infrared comparisons with compounds previously studied demonstrate that the hydroxytropenylium ion is a stronger hydrogen bond donor than either choline cation or protonated betaine cation, and suggest that hydroxytropenylium fluoride, if it can be prepared, should contain a three-center covalent hydrogen bond.
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