The present investigation goal was to investigate the chemistry of four new mononuclear mixed ligand Fe(III), Co(II), Cu(II), and Cd(II) complexes constructed from furfural-type imine ligand (L), and the co ligand 2,2′-bipyridine in addition to assessing their antimicrobial activity against some bacterial, and fungi strains. The structure of the complexes was interpreted by different spectroscopic techniques such as MS, IR, 1H NMR, UV–Vis, elemental analysis, TG-DTG, conductivity, and magnetic susceptibility measurements. The correlation of all results revealed that ligand (L) acts as a neutral ONNO tetradentate whereas the co ligand acts as a neutral NN bidentate. The coordination of the ligands with the metal ions in a molar ratio of 1:1:1 leads to formation of an octahedral geometry around the metal ions. The octahedral geometry has been validated and optimized by DFT analysis. Conductivity data showed the electrolytic nature of all complexes. The thermal stability of all complexes was deduced in addition to evaluating some thermodynamic, and kinetic parameters using Coats–Redfern method. Furthermore, all complexes in comparison to their parent ligands were tested for their biological potency against some pathogenic bacterial, and fungi strains using the paper disk diffusion method. [CdL(bpy)](NO3)2 complex revealed the highest antimicrobial activity.
A series of four binuclear complexes [Cr2(CO)2L2] (1), [Mo2O4(L)2] (2), and [W2O4(L)2] (3) [Mo2O5(CO)L].H2O (4) were synthesized from the reaction of [M(CO)6] (M = Cr, Mo and W) with 6,6'-(([1,1'-biphenyl]-4,4' diylbis(azaneylylidene)) bis(methaneylylidene)) bis(2,4-dichlorophenol) H2L in THF. The structures of the ligand and its complexes were characterized using elemental studies, IR, mass, UV-vis and 1 H NMR spectroscopy. Magnetic measurements showed diamagnetic properties for molybdenum and tungsten complexes and paramagnetic character for chromium complex. The thermal analyses for all metal complexes were also determined by the thermogravimetry technique. The thermodynamics parameters of complexes were calculated. Spectroscopic data revealed that H2L was coordinated as a tetradentate ligand through two imine nitrogen and two deprotonated phenolic oxygen atoms. The Schiff base ligand (H2L) and its complexes displayed fluorescence properties and can potentially serve as photoactive materials. The values of optical band gap energy (Eg) of the prepared complexes suggested that these compounds could be used as semiconductors.
A new Schiff base ligand N2-((5-methylthiophen-2-yl) methylene) pyridine-2,6-diamine (L) was prepared by condensation of 5-Methyl-2-thiophenecarboxaldehyde and 2,6-diaminopyridine in ethanol in a molar ratio 1:1. The ligand and its complexes were characterized based on elemental analyses, molar conductance, magnetic moment, IR, MS, 1H NMR, solid reflectance, and thermal analysis (TG and DTG) techniques. The complexes were found to have the formulas [CoL(H2O) Cl2].H2O and [NiL(H2O)Cl2].2H2O. From FTIR spectral data, the coordination between the ligand L to the central metal ion was through its nitrogen of pyridyl and azomethine and sulfur of 2-thiophenecarboxaldehyde. The metal complexes were found to be nonelectrolyte. Octahedral geometries of the Co(II) and Ni(II) complexes were investigated from electronic and magnetic data. The kinetic analysis of the thermogravimetric data was performed by using the Coats-Redfern equation. The fluorescence properties of the ligand and its complexes in DMF were studied. The values of optical band gap energy (Eg) of the synthesized complexes suggested that these compounds could be used as semiconductors. The adsorption of Co2+ and Ni2+ in aqueous solutions on ligand under various conditions was studied. The maximum adsorption percentage of Co(II) and Ni(II) were found to be 68% and 65%, respectively. The Molecular docking studies were executed to consider the nature of binding and binding affinity of the synthesized compounds with the receptor of Bacillus subtilis (gram +ve bacteria) and Escherichia coli (gram –ve bacteria) (PDB ID: 1fj4). The ligand and its complexes were tested as antimicrobial agents.
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