Synthesis, Crystal Structure and Antibacterial Activity of N'-(2-Bromobenzylidene)-4-methylbenzohydrazide
作者:Daohang He、Xianping Liu、Yongchuang Zhu
DOI:10.14233/ajchem.2015.16798
日期:——
A Schiff base compound, N-(2-bromobenzylidene)-4-methylbenzohydrazide (m.f. C15H13N2OBr) has been synthesized by the condensation of 4-methylbenzohydrazide and 2-bromobenzaldehyde in an ethanol solution. The compound was characterized by 1H NMR, MS and single crystal X-ray diffraction. Here, we first report the crystal structure and antibacterial activities of the title compound. The crystal belongs to the orthorhombic system, space group Pna21 with a = 9.5295 (6), b = 11.4154 (7), c = 12.5957 (8) Å, Z = 4, V = 1370.20 (15) Å, Dc = 1.538 g/cm3, Mr = 317.18, l(MoKa) = 0.71073 Å, μ = 2.993 mm-1, F(000) = 640. The final R = 0.0292, wR = 0.0674 for 1904 observed reflections with I > 2s (I). The dihedral angle between the two phenyl rings is 16.31°. The structure exhibits intermolecular hydrogen bonding of N-H···O type. The title compound molecules are connected through hydrogen bonds to generate a one-dimensional chain. The preliminary biological activity assay results showed that the title compound exhibited good antibacterial activity against Staphylococcus aureus and Escherichia coli.
通过 4-甲基苯甲酰肼和 2-溴苯甲醛在乙醇溶液中缩合,合成了席夫碱化合物 N-(2-溴苯亚甲基)-4-甲基苯甲酰肼(m.f. C15H13N2OBr)。该化合物通过1H NMR、MS和单晶X射线衍射进行了表征。在这里,我们首先报告了标题化合物的晶体结构和抗菌活性。该晶体属于斜方晶系,空间群 Pna21,a = 9.5295 (6),b = 11.4154 (7),c = 12.5957 (8) Å,Z = 4,V = 1370.20 (15) Å,Dc = 1.538 g /cm3,Mr = 317.18,l(MoKa) = 0.71073 Å,μ = 2.993 mm-1,F(000) = 640。对于 1904 个 I > 2s (I) 观察到的反射,最终 R = 0.0292,wR = 0.0674。两个苯环之间的二面角为16.31°。结构呈现N-H…O型分子间氢键。标题化合物分子通过氢键连接形成一维链。初步生物活性测定结果表明,标题化合物对金黄色葡萄球菌和大肠杆菌具有良好的抗菌活性。