N-(4-Nitro-phen-yl)cinnamamide

Synthesis, Characterization, and Crystal Structure of N-(3-nitrophenyl)cinnamamide

N-(3-nitrophenyl)cinnamamide 1 with formula C15H12N2O3 was synthesized, and its crystal structure was determined by single-crystal X-ray diffraction analysis. Compound 1 crystallizes in the monoclinic space group P21/n with unit cell dimensions: a = 6.7810 (5) Å, b = 23.0913 (15) Å, c = 8.2079 (5) Å, V = 1282.76 (15) Å3, Z = 4, determined at 150 K with MoKα radiation. The experimental structure refined against atomic scattering factors is compared with the structure obtained using a Hirshfeld Atom Refinement (HAR) approach and Density Functional Theory (DFT) geometry optimizations.

N-(2-Fluoro-phen-yl)cinnamamide

The title compound, C₁₅H₁₂FNO, was prepared by the reaction of cinnamoyl chloride with 4-fluoro­aniline and crystallizes with two mol­ecules A and B in the asymmetric unit. The two unique mol­ecules are closely similar and overlay with an r.m.s. deviation of 0.0819 Å. The fluoro­benzene and phenyl rings are inclined to one another at 73.89 (7) and 79.46 (7)°, respectively, in mol­ecules A and B. The amide C—N—C(O)—C portions of the mol­ecules are planar (r.m.s. deviations = 0.035 and 0.028 Å) and are inclined at 45.51 (9) and 47.71 (9), respectively, to the fluoro­benzene rings in mol­ecules A and B. The 2-fluoro­acetamide units and the benzene rings each adopt E configurations with respect to the C=C bonds. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds augmented by weak C—H⋯π inter­actions link mol­ecules into rows in a head-to-tail fashion along a. Additional weak C—H⋯O contacts further stabilize the packing, forming a three-dimensional network stacked down a.