Unclassical Hydrogen Bonds of C–H⋯N and C–H⋯Cl in the Crystal Structures of 2-((E)-1,3-diarylallylidene)malononitriles
作者:Xiang-Shan Wang、Qing Li、Jian-Rong Wu、Mei-Mei Zhang
DOI:10.1007/s10870-010-9837-0
日期:2011.1
The 2-((E)-3-(2-nitrophenyl)-1-(4-methoxyphenyl)allylidene)malononitrile and 2-((E)-3-(2-chlorophenyl)-1-(4-bromophenyl)allylidene)malononitrile were synthesized and characterized by IR, 1H NMR, and elemental analysis. The molecular structures were further confirmed by X-ray diffraction analysis. The former 1, C19H13N3O3, is triclinic, space group P−1, a = 7.3834(13), b = 10.901(3), c = 11.227(2) Å, α = 88.64(2), β = 71.596(14), γ = 78.186(18), Z = 2, V = 838.5(3) Å3. The unclassical hydrogen bond of C–H⋯N links the molecules forming polymers. The latter 2, C36H20Br2Cl2N4, is orthorhombic, space group Pnma, a = 20.900 (4), b = 7.0710 (11), c = 10.9170 (18) Å, Z = 2, V = 1613.4(5) Å3. The same hydrogen bond of C–H⋯N and another type of C–H⋯Cl hydrogen bond link the adjacent molecules forming polymers along a axis. The 2-((E)-3-(2-nitrophenyl)-1-(4-methoxyphenyl)allylidene)malononitrile and 2-((E)-3-(2-chlorophenyl)-1-(4-bromophenyl)allylidene)malononitrile were synthesized and characterized by IR, 1H NMR and elemental analysis. The molecular structures were further confirmed by X-ray diffraction analysis. The former 1, C19H13N3O3, is triclinic, space group P−1, a = 7.3834(13), b = 10.901(3), c = 11.227(2) Å, α = 88.64(2), β = 71.596(14), γ = 78.186(18), Z = 2, V = 838.5(3) Å3. The unclassical hydrogen bond of C–H⋯N links the molecules forming polymers. The latter 2, C36H20Br2Cl2N4, is orthorhombic, space group Pnma, a = 20.900 (4), b = 7.0710 (11), c = 10.9170 (18) Å, Z = 2, V = 1613.4(5) Å3. The same hydrogen bond of C–H⋯N and another type of C–H⋯Cl hydrogen bond link the adjacent molecules forming polymers along a axis.
2-((E)-3-(2-chlorophenyl)-1-(4-bromophenyl)allylid�en)malononitrile合成后,通过红外光谱、1H核磁共振和元素分析进行了表征。分子结构通过X射线衍射分析进一步确认。前者1,C19H13N3O3,为三斜晶系,空间群P−1,a = 7.3834(13),b = 10.901(3),c = 11.227(2) Å,α = 88.64(2),β = 71.596(14),γ = 78.186(18),Z = 2,V = 838.5(3) Å3。C-H⋯N的非经典氢键将分子连接形成聚合物。后者2,C36H20Br2Cl2N4,为正交晶系,空间群Pnma,a = 20.900 (4),b = 7.0710 (11),c =&