Abstract
The title compound (Z)-4-(4-oxopent-2-en-2-ylamino)benzonitrile, C12H12N2O, was synthesized by the condensation of acetylacetone and 4-aminobenzonitrile in methanol, with a few drops of formic acid as catalyst. Crystallization of the reaction product solution yielded both pure crystals of the title compound, as well as an inclusion product with a strict 1:1 stoichiometry with one of the reactants, 4-aminobenzonitrile. Crystals of the reactant-inclusion compound, C12H12N2O–C7H6N2 (I), and pure C12H12N2O (II) have been determined at 143(2) and 88(2) K, respectively. The mixed-form crystals crystallized in the monoclinic system, whereas pure-form crystals crystallized in the triclinic system. Intramolecular hydrogen bonds of the type N–H···O were observed in both the mixed and pure-form crystals. However, in the mixed-form, the two components are connected by a N3–H3···N2 intermolecular hydrogen bond, which gives rise to a planar structure and parallel packing of adjacent molecules. In contrast, the structure of the pure compound without any reactant molecule interactions is not planar and exhibits a more complicated stacking array for adjacent molecules.
Graphical Abstract
The title compound (Z)-4-(4-oxopent-2-en-2-ylamino)benzonitrile, C12H12N2O, was synthesized by the condensation of acetylacetone and 4-aminobenzonitrile in methanol. Crystallization of the reaction product solution yielded both pure crystals of the title compound, as well as an inclusion product with a strict 1:1 stoichiometry with one of the reactants, 4-aminobenzonitrile. The mixed-form crystals crystallized in the monoclinic system, whereas pure-form crystals crystallized in the triclinic system. Intramolecular hydrogen bonds of the type N–H···O were observed in both the mixed and pure-form crystals. However, in the mixed-form, the two components are connected by a N3–H3···N2 intermolecular hydrogen bond, which gives rise to a planar structure and parallel packing of adjacent molecules. In contrast, the structure of the pure compound without any reactant molecule interactions is not planar and exhibits a more complicated stacking array for adjacent molecules.
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The authors would like to thank the National Science Foundation (CHE-0911061) for financial support.
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Patil, S.A., Medina, P.A., Dever, S. et al. Influence of Reactant 4-Aminobenzonitrile Inclusion on the Crystal Structure of (Z)-4-(4-oxopent-2-en-2-ylamino)benzonitrile. J Chem Crystallogr 44, 82–88 (2014). https://doi.org/10.1007/s10870-013-0486-y
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DOI: https://doi.org/10.1007/s10870-013-0486-y