Received 1 September 2008
In the title co-crystal, C22H14O4·CH4N2O, the 1,1'-binaphthyl-2,2'-dicarboxylic acid (BNDA) and urea molecules are connected via a system of hydrogen bonds into a chiral two-dimensional polymeric structure parallel to the (001) plane. As the crystal is centrosymmetric, it consists of alternately stacked BNDA-urea layers of opposite chirality. The urea H atoms trans to the C=O group are bonded in a chelating mode [R12(6)] to the carbonyl O atom from one of the carboxylic acid groups which, in turn, acts as the donor of an O-HO hydrogen bond to another urea molecule. The  chains thus formed are further connected via an R22(8) hydrogen-bond motif formed between urea and the second carboxylic acid group of BNDA.
Data collection: STADI4 (Stoe & Cie, 1997); cell refinement: STADI4; data reduction: X-RED (Stoe & Cie, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP (Siemens, 1994); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: GK2167 ).
Support of this research by the Uzbek Academy of Sciences (grant No. FA-F3-T141) is gratefully acknowledged.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Siemens (1994). XP. Siemens Analytical X-ray Instruments Inc., Madison, Wisconsin, USA.
Stoe & Cie (1997). STADI4 and X-RED. Stoe & Cie, Darmstadt, Germany.
Weber, E. (1996). Comprehensive Supramolecular Chemistry. Solid-State Supramolecular Chemistry: Crystal Engineering, Vol. 6, edited by D. D. MacNicol, F. Toda & R. Bishop, pp. 535-592. Oxford: Pergamon.
Weber, E., Csöregh, I., Stensland, B. & Czugler, M. (1984). J. Am. Chem. Soc. 106, 3297-3306.