Acta Cryst. (2008). E64, o1945  [ doi:10.1107/S1600536808028997 ]

1,1'-Binaphthyl-2,2'-dicarboxylic acid-urea (1/1)

L. Izotova, J. Ashurov, S. Talipov, B. Ibragimov and E. Weber

Abstract: 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 [010] chains thus formed are further connected via an R²₂(8) hydrogen-bond motif formed between urea and the second carboxylic acid group of BNDA.

Online 17 September 2008

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