New tetradentate N2O2 donor Schiff bases and their mononuclear Co(II), Ni(II), Cu(II), and Pd(II) complexes were synthesized and characterized extensively by IR, 1H-, 13C-NMR, mass, ESR, conductivity measurements, elemental and thermal analysis. Specifically the magnetic and electronic spectral measurements demonstrate the octahedral structures of cobalt(II), nickel(II) complexes and square planar geometries of copper(II), palladium(II) complexes. All the ligands and complexes were screened for their in vitro antibacterial activity against two Gram-positive bacteria (Bacillus subtilis, Staphylococcus aureus) and two Gram-negative bacteria (Escherichia coli, Klebsiella pneumonia). In this study, Pd(II) complexes exhibited potent antibacterial activity against B. subtilis, S. aureus whereas other metal complexes also exerted good activity towards all tested strains even than standard drugs streptomycin and ampicillin.
合成了新的四价
N2O2 给体希夫碱及其单核 Co(II)、Ni(II)、Cu(II) 和 Pd(II) 配合物,并通过红外光谱、1H-、13C-NMR、质量、ESR、电导率测量、元素和热分析对其进行了广泛表征。特别是磁谱和电子谱测量结果表明,
钴(II)和
镍(II)配合物为八面体结构,
铜(II)和
钯(II)配合物为方形几何结构。对所有
配体和配合物进行了体外抗菌活性筛选,以检测它们对两种革兰氏阳性菌(枯草杆菌、
金黄色葡萄球菌)和两种革兰氏阴性菌(大肠埃希菌、肺炎克雷伯菌)的抗菌活性。在这项研究中,
钯(II)配合物对枯草杆菌和
金黄色葡萄球菌具有很强的抗菌活性,而其他
金属配合物对所有测试菌株也具有很好的活性,甚至超过了标准药物
链霉素和
氨苄西林。