The Crystal Structures of (Z)-Ethyl 2-(4-chlorophenyl)-3-(2,4-difluorophenyl-amino)acrylate and its Analogues
作者:Zhu-Ping Xiao、Rui-Qin Fang、Tian Liu、Xu-Dong Wang、Ze-Jun Huang、Mei-Lin Liao
DOI:10.1007/s10870-011-0075-x
日期:2011.8
The title compound, C17H14ClF2NO2, crystallizes in monoclinic space group P21/c with unit cell dimension of a = 16.276(3) Å, b = 7.5030(15) Å, c = 13.812(3) Å, α = 90°, β = 111.11(3)°, γ = 90° and Z = 4. The structure of the title compound reveals a Z configuration with respect to the C=C double bond in aminoacrylate fragment. The molecule is stabilized by intramolecular N–H···F and N–H···O hydrogen bonds. In the ethyl 2-aryl-3-arylaminoacrylates, electronic properties of the substituents in the aniline motif clearly affected the attached C–N bond length, and such effect is very little relative to Z-/E-configuration with respect to the C=C double bond. The Ar–N bond length in the crystals of ethyl 2-aryl-3-arylaminoacrylate is sensitive to the electronic property of the substituent in aniline motif. An electronic-donating group would lengthen the Ar–N bond.
标题化合物 C17H14ClF2NO2 结晶于单斜空间群 P21/c,单胞尺寸为 a = 16.276(3) Å, b = 7.5030(15) Å, c = 13.标题化合物的结构揭示了氨基丙烯酸酯片段中 C=C 双键的 Z 构型。分子内的 N-H-F 和 N-H-O 氢键稳定了分子结构。在 2-芳基-3-芳基氨基丙烯酸乙酯中,苯胺基团中取代基的电子特性明显影响了所附的 C-N 键长度,而相对于 C=C 双键的 Z-/E- 配置,这种影响非常小。2- 芳基-3-芳基氨基丙烯酸乙酯晶体中的 Ar-N 键长度对苯胺基团中取代基的电子特性非常敏感。电子捐赠基团会延长 Ar-N 键的长度。