Date Published: August 01, 2009
Publisher: International Union of Crystallography
Author(s): Xin Zhang, Meng Huang, Cong Du, Dan Chen.
The title compound, C20H18ClN3O3, is in an enamine–keto form, stabilized by two strong intramolecular N—H⋯O hydrogen bonds. The pyrazole ring is oriented at dihedral angles of 4.13 (3) and 85.60 (3)° with respect to the aromatic rings. The dihedral angle between the aromatic rings is 81.79 (3)°. In the crystal structure, intermolecular C—H⋯O hydrogen bonds link the molecules into double chains, which are further linked by weak C—H⋯π interactions, forming a two-dimensional network.
For general background to Schiff base compounds in coordination chemistry, catalysis and enzymatic reactions, magnetism and molecular architectures, see: Habibi et al. (2007 ▶). For the anti-bacterial properties of Schiff bases derived from 4-acyl-5-pyrazolones and their metal complexes, see: Li et al. (1997 ▶, 2004 ▶). For the anti-bacterial and biological activity of amino acid esters, see: Xiong et al. (1993 ▶). For related structures, see: Pettinari et al. (1994 ▶); Wang et al. (2003 ▶); Zhang et al. (2005 ▶); Zhu et al. (2005 ▶). For bond-length data, see: Allen et al. (1987 ▶).