ABSTRACT. The present work comprises preparation, characterization, thermal behavior and growth inhibitory activity of some novel Co(II) complexes derived from substituted (E)-1-(1-hydroxy-4-iodonaphthalen-2-yl)-3-phenylprop-2-en-1-one (L1) and (E)-1-(4-bromo-1-hydroxynaphthalen-2-yl)-3-phenylprop-2-en-1-one (L2-L6). Newly synthesized metal-ligand complexes were structurally confirmed with suitable spectroscopic technique such as FT-IR, EPR, NMR (both 1H and 13C). XRD analysis for complex C1 confirmed the crystal system; tetragonal and space group; P 42/n: 2 with unit cell dimensions a, b = 13.3516 Å, c = 10.8009 Å; α, β, γ = 90o. The IR and EPR study demonstrated that interaction between metal ions and ligand occurs through carbonyl oxygen and hydroxyl oxygen. From the values of magnetic moment (μ) it was observed that synthesized complexes (C1-C6) are paramagnetic with three unpaired electrons contain one electron in t2g orbital and two electrons in eg orbitals. Further all these complexes have been evaluated in-vitro for their antimicrobial activity against the Gram positive bacteria Staphylococcus aureus, Gram negative bacteria Escherichia coli and the yeast Candida albicans. The complex C1 showed the significant antimicrobial activity, whereas the complexes C2, C4, C5 and C6 are moderately active against the tested pathogens. The antimicrobial data revealed that growth inhibitory activities of complexes were enhanced comparatively than its respective ligands. The enhanced antimicrobial activity is attributed to the presence of halogens (Br, Cl, I) and hydroxyl (OH) active substituents associated with the basic nucleus of complexes. Therefore, the present study helps to develop a new class of antimicrobial analogues.
KEY WORDS: Metal complexes synthesis, 1,3-Diaryl-2-propene-1-one, Crystal structure, Thermal properties, Antimicrobial activity
Bull. Chem. Soc. Ethiop. 2021, 35(3), 513-524.
DOI: https://dx.doi.org/10.4314/bcse.v35i3.4
摘要:本研究包括制备、表征、热行为和生长抑制活性的一些新型Co(II)配合物,这些配合物来自于取代的(E)-1-(1-羟基-4-碘萘-2-基)-3-苯基丙-2-烯-1-酮(L1)和(E)-1-(4-溴-1-羟基萘-2-基)-3-苯基丙-2-烯-1-酮(L2-L6)。新合成的金属配体配合物通过适当的光谱技术(如FT-IR、EPR、NMR(1H和13C))进行了结构确认。复合物C1的XRD分析证实了晶体系统;四方晶系和空间群;P 42/n:2,具有单元格尺寸a、b = 13.3516 Å,c = 10.8009 Å;α,β,γ = 90o。IR和EPR研究表明,金属离子和配体之间的相互作用是通过羰基氧和羟基氧发生的。从磁矩(μ)值可以观察到,合成的配合物(C1-C6)是顺磁性的,含有三个未成对电子,其中一个电子在t2g轨道中,两个电子在eg轨道中。进一步,所有这些配合物已经在体内评估其抗菌活性,对革兰氏阳性细菌金黄色葡萄球菌、革兰氏阴性细菌大肠杆菌和酵母菌白色念珠菌。复合物C1显示出显著的抗菌活性,而复合物C2、C4、C5和C6对测试的病原体具有中等活性。抗菌数据表明,与其相应的配体相比,复合物的生长抑制活性得到了增强。增强的抗菌活性归因于卤素(Br、Cl、I)和羟基(OH)活性取代基与配合物的基本核心相关。因此,本研究有助于开发一类新的抗菌类似物。
关键词:金属配合物合成,1,3-二芳基-2-丙烯-1-酮,晶体结构,热性质,抗菌活性
《埃塞俄比亚化学学会杂志》2021年,35(3),513-524。
DOI:https://dx.doi.org/10.4314/bcse.v35i3.4