Synthesis, Characterization, and Crystal Structures of 3-bromo-N′-(2-methoxybenzylidene)benzohydrazide and N′-(2-methoxybenzylidene)-3,4-methylenedioxybenzohydrazide
作者:Hai-Yun Zhu
DOI:10.1007/s10870-011-9982-0
日期:2011.11
Two new hydrazone compounds, 3-bromo-N′-(2-methoxybenzylidene)benzohydrazide (1) and N′-(2-methoxybenzylidene)-3,4-methylenedioxybenzohydrazide (2), have been synthesized and characterized by elemental analysis, IR, and single crystal X-ray diffractions. Compound (1) crystallizes in the triclinic space group P1 with unit cell dimensions a = 8.4088(5) Å, b = 8.5398(5) Å, c = 10.6572(6) Å, α = 90.356(3)°, β = 102.868(3)°, γ = 97.987(3)°, V = 738.28(7) Ǻ3, Z = 2, R 1 = 0.0406, and wR 2 = 0.0804. Compound (2) crystallizes in the tetragonal space group P41 with unit cell dimensions a = b = 9.792(4) Å, c = 15.788(6) Å, V = 1513.8(10) Ǻ3, Z = 4, R 1 = 0.0415, and wR 2 = 0.0818. The molecules of both compounds display E configurations with respect to the C=N double bonds. In the crystal structure of (1), molecules are linked through N–H···O hydrogen bonds, forming chains running along the b axis. In the crystal structure of (2), molecules are linked through N–H···O hydrogen bonds, forming chains running along the c axis. Two new hydrazone compounds have been prepared and structural characterized by physico-chemical methods and single crystal X-ray diffraction.
我们合成了两种新的腙类化合物,即 3-溴-N′-(2-甲氧基亚苄基)苯腙肼 (1) 和 N′-(2-甲氧基亚苄基)-3,4-亚甲二氧基苯腙肼 (2),并通过元素分析、红外光谱和单晶 X 射线衍射对其进行了表征。化合物 (1) 在三linic 空间群 P1 中结晶,单胞尺寸 a = 8.4088(5) Å,b = 8.5398(5) Å,c = 10.6572(6) Å,α = 90.356(3)°,β = 102.868(3)°,γ = 97.987(3)°,V = 738.28(7) Ǻ3,Z = 2,R 1 = 0.0406,wR 2 = 0.0804。化合物(2)在四方空间群 P41 中结晶,单胞尺寸 a = b = 9.792(4) Å,c = 15.788(6) Å,V = 1513.8(10) Ǻ3,Z = 4,R 1 = 0.0415,wR 2 = 0.0818。这两种化合物的分子在 C=N 双键上都呈 E 型构型。在 (1) 的晶体结构中,分子通过 N-H-O 氢键相连,形成沿 b 轴延伸的链。在 (2) 的晶体结构中,分子通过 N-H-O 氢键相连,形成沿 c 轴的链。通过物理化学方法和单晶 X 射线衍射,制备了两种新的腙化合物并确定了其结构特征。