File Name: schiff base ligands and their metal complexes .zip
The magnetic susceptibility measurements and low conductance data provide evidence for the monomeric and neutral natures of the complexes respective ly. The antimicrobial activities of the ligands and their complexes have been studied by screening the compounds against the bacteria E.
New Schiff base ligands derived from vanillin HL 1 , 4-dimethylaminobenzaldehyde HL 2 and 3,5-di-t-butylhydroxybenzaldehyde HL 3 with N- pyridyl methoxyhydroxyaminobenzylamine 2 and their copper II , cobalt II , nickel II , oxovanadium IV and zinc II transition metal complexes have been synthesized and characterized by elemental analyses, electronic and i. The results indicate that the ligands coordinate through azomethine nitrogen and phenolic oxygen to the metal ions. In like manner, it was found that the pyridine and amine nitrogen atoms are not coordinated to the metal ions. The antimicrobial activity properties of the ligands and their metal complexes have been studied.
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The efficiency of such a process is strongly dependent on the various molecular interactions occurring between components. Thermodynamic properties of these systems can provide valuable information about structural interactions. Therefore, in this work, the interactions of the IL 1-hexylmethylimidazolium chloride [HMIm]Cl with Schiff bases in organic solvents were studied through the measurements of density, viscosity, and electrical conductivity. If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center. Go to our Instructions for using Copyright Clearance Center page for details. Authors contributing to RSC publications journal articles, books or book chapters do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. If the material has been adapted instead of reproduced from the original RSC publication "Reproduced from" can be substituted with "Adapted from".
Their spectral properties and electrochemical behavior were investigated. During the past two decades, considerable attention has been paid to the chemistry of the metal complexes of Schiff bases containing nitrogen and other donors [ 1 , 2 , 3 , 4 ]. This may be attributed to their stability, biological activity [ 5 ] and potential applications in many fields such as oxidation catalysis [ 6 ], electrochemistry [ 7 ], etc. The ligand H 2 L was prepared as outlined in Figure 1. The disappearance of the OH band of the free ligand in the IR of the metal complexes indicates that the OH group is deprotonated and coordinated to the metal ion as —O -. According to the aforementioned data, we propose for the complexes prepared the structure shown in Figure 2.
The complexes show enhanced antibacterial activity against S. Developing metal-based drugs is emerging as an active area of research. Many organic ligands particularly tridentate Schiff base ligands show enhanced antibacterial, antifungal, and carcinostatic activity when complexed to transition metal ions [ 1 — 7 ]. Heterocyclic systems bearing the pyrazolyl moiety show antibacterial, antifungal, anti-inflammatory and enzyme-inhibitory activity [ 8 — 11 ]. Synthesis and characterization of metal complexes of 4-acylpyrazoles are well documented [ 12 — 14 ].
Transition metal complexes of bidentate Schiff base ligands
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The Schiff bases coordinate to the metal atoms through the phenolate O and imine N atoms. The Ni atom in 1 is in an octahedral coordination, and the Cu atom in 2 is in a square planar coordination. Keywords: Schiff base; nickel complex; copper complex; crystal structure. Schiff bases have been widely used as versatile ligands in coordination chemistry. Materials and Methods: All organic chemicals were purchased from Fluka. The metal salts and solvents with analytical grade were obtained commercially. The Schiff bases were prepared according to the literature method.
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