A new ligand, (1H-pyrrol-2-yl)isonicotinoylhydrazone (Pyr-inh) and its metal complexes have been synthesised and characterized by elemental analyses, IR, 1H and 13C-NMR, UV-Vis spectra, molar conductance, and thermogravimetry-differential thermal analysis (TG-DTA). From the results obtained, the structure of the complexes are of general formula [M(Pyr-inh)2Cl2].xH2O for M = Co(II), and Zn(II) and [M(Pyr-inh)2(H2O)2]Cl2 for Cu(II). The thermal behaviour of these complexes showed the loss of lattice water in the first step followed by decomposition of the ligand in subsequent steps. The ligand and its transition metal complexes were studied for their in vitro antibacterial activity against ten pathogenic bacterial strains. The data obtained revealed that the ligand was active against Morganella morganii and Escherichia coli, the Co(II) complex active against Klebsiella oxytoca, the Cu(II) complex showed significant activity against five out of the ten bacterial strains and the Zn(II) complex was active against all the pathogenic bacterial strains investigated.
我们合成了一种新
配体 (1H-pyrrol-2-yl)isonicotinoylhydrazone (Pyr-inh)及其
金属配合物,并通过元素分析、红外光谱、1H 和 13C-NMR 光谱、紫外可见光谱、摩尔电导率和热重-差热分析 (TG-DTA) 对其进行了表征。从所得结果来看,M = Co(II)和 Zn(II)的配合物结构通式为[M(Pyr-inh)2Cl2].x ,Cu(II)的配合物结构通式为[M(Pyr-inh)2(
H2O)2]Cl2。这些配合物的热行为表明,在第一步中晶格
水会流失,随后
配体会分解。研究了
配体及其过渡
金属配合物对十种致病细菌菌株的体外抗菌活性。获得的数据显示,
配体对摩根氏菌和大肠埃希氏菌具有活性,Co(II) 复合物对克雷伯氏菌具有活性,Cu(II) 复合物对十种细菌菌株中的五种具有显著活性,Zn(II) 复合物对所有调查的致病细菌菌株都具有活性。