Acta Cryst. (2001). B57, 329-338 [doi:10.1107/S0108768100019832]
Abstract: The trigonally trisubstituted acid 3,5-dihydroxybenzoic acid forms hydrated salt-type adducts with organic diamines. In 1,4-diazabicyclo[2.2.2]octane-3,5-dihydroxybenzoic acid-water (1/1/1) (1), where Z' = 2 in P21/c, the constitution is [HN(CH2CH2)3N]+·[(HO)2C6H3COO]-·H2O: the anions and the water molecules are linked by six O-H
O hydrogen bonds to form two-dimensional sheets and each cation is linked to a single sheet by one O-HN and one N-HO hydrogen bond. Piperazine-3,5-dihydroxybenzoic acid-water (1/2/4) (2) and 1,2-diaminoethane-3,5-dihydroxybenzoic acid-water (1/2/2) (3) are also both salts with constitutions [H2N(CH2CH2)2NH2]2+·2[(HO)2C6H3COO]-·4H2O and [H3NCH2CH2NH3]2+·2[(HO)2C6H3COO]-·2H2O, respectively. Both (2) and (3) have supramolecular structures which are three-dimensional: in (2) the anions and the water molecules are linked by six O-HO hydrogen bonds to form a three-dimensional framework enclosing large centrosymmetric voids, which contain the cations that are linked to the framework by two N-HO hydrogen bonds; in (3) the construction of the three-dimensional framework requires the participation of cations, anions and water molecules, which are linked together by four O-HO and three N-HO hydrogen bonds.
Online 25 May 2001
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