P. Kosma, E. Selzer, K. Mereiter
Nov 24, 2012
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Journal
Acta Crystallographica Section E: Structure Reports Online
Abstract
The molecular structure of the title compound, C20H18N2O5S·C3H7NO, represents an essentially planar 5-benzylidene-thiazolidine moiety (r.m.s. deviation from planarity without ring substituents = 0.095 Å) to which the 4-aminobenzoic acid fragment is inclined at 76.23 (1)°. In the crystal, the benzoic acid molecules are arranged in layers parallel to [001] which are built up from inversion dimers held together by head-to-tail phenol–carboxy O—H⋯O hydrogen bonds and head-to-tail π–π stacking interactions between the 5-benzylidene-thiazolidine moieties (ring centroid distance = 3.579 Å). These layers are separated by the dimethylformamide solvent molecules which are firmly anchored via a short O—H⋯O hydrogen bond [O⋯O = 2.5529 (10) Å] donated by the –COOH group.