The mixed ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Schiff basesN-(2-hydroxy-1-naphthylidene)-4-methylaniline (L1H) andN-(2-hydroxybenzylidene)-2,3-dimethylaniline (L2H) have been synthesized and characterized. The resulting complexes were characterized by elemental analysis, thermogravimetric analysis, magnetic moment measurements, conductivity measurements,1H NMR, IR, UV-visible and ESR spectral studies. The Schiff bases acts as bidentate monobasic ligands, coordinating through deprotonated phenolic oxygen and azomethine nitrogen atoms. The complexes are non-electrolytic in DMSO. The presence of the two coordinated water molecules in these complexes was indicated by IR spectra and thermogravimetric analysis of the complexes. From the analytical and spectral data the stoichiometry of these complexes have been found to be [M(L1)(L2)(H2O)2] where M = Co(II) , Ni(II), Cu(II) and Zn(II)}. It is found that Co(II), Ni(II), Cu(II) and Zn(II) complexes exhibited octahedral geometry. The antimicrobial activities of ligands and their mixed ligand complexes were screened by disc diffusion method. It is found that the metal complexes have higher antimicrobial activity than the free ligand.
Co(II)、Ni(II)、Cu(II)和Zn(II)与席夫碱N-(2-羟基-1-萘醛基)-4-甲基苯胺(L^1H)和N-(2-羟基苯甲醛基)-2,3-二甲基苯胺(L^2H)的混合配体配合物已合成并表征。通过元素分析、热重分析、磁矩测量、电导率测量、^1H NMR、IR、UV-可见光谱和ESR光谱研究对结果配合物进行了表征。席夫碱作为双齿一碱性配体,通过去质子酚氧和偶氮亚甲基氮原子进行配位。这些配合物在DMSO中是非电解质的。通过IR光谱和配合物的热重分析指出这些配合物中存在两个配位的水分子。通过分析和光谱数据,这些配合物的化学计量比已确定为[M(L^1)(L^2)(H2O)2] 其中M = Co(II)、Ni(II)、Cu(II)和Zn(II)}。发现Co(II)、Ni(II)、Cu(II)和Zn(II)配合物呈八面体几何构型。通过圆盘扩散法筛选了配体及其混合配体配合物的抗菌活性。发现金属配合物的抗菌活性高于自由配体。