Acta Crystallographica Section E

Structure Reports Online

Volume 68, Part 12 (December 2012)

organic compounds

Acta Cryst. (2012). E68, o3417-o3418    [ doi:10.1107/S1600536812047307 ]

4-({(Z)-5-[(Z)-3-Eth­oxy-4-hy­droxy­benzyl­idene]-3-methyl-4-oxo-1,3-thia­zolidin-2-yl­idene}amino)­benzoic acid dimethyl­formamide monosolvate

P. Kosma, E. Selzer and K. Mereiter

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 [pi]-[pi] 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.

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