Abstract
The crystal structures of γ-resorcylic acid (2,6-dihydroxybenzoic acid), C 7 H 6 O 4 , (I), γ-resorcylic acid monohydrate, C 7 H 6 O 4 .H 2 O, (II), and pyridinium γ-resorcylate, C 5 H 6 N + .C 7 H 5 O 4 - , (III), have been determined. In (I) and (II), the carboxyl group of the γ-resorcylic acid molecule is in an anti conformation and the carboxylic OH group is involved as a donor in an O-H...O intramolecular hydrogen bond. This bond is part of an infinite hydrogen-bonded chain with mixed σ- and π-bond cooperativity. Structure (II) is disordered and may be considered to result from the superposition of two lower-symmetry structures related by a mirror plane
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