Oxovanadium(IV) Complexes with Triazole Based Schiff Base Ligands: Synthesis, Characterization and Antibacterial Study

Abstract

Schiff bases have been synthesized by the reaction of triazole containing primary amine with aromatic carbonyl compounds. The Schiff bases prepared, act as ligand when these are made in contact with oxovanadium (VO2+) ion. Some new mononuclear oxovanadium(IV) complexes have been synthesized by the reaction of Schiff base ligands with vanadyl sulphate (VOSO4.xH2O) and the complexes are analyzed by different spectroscopic methods; [fourier-transform infrared (FTIR), ultraviolet-visible (UV-Vis.), electron paramagnetic resonance (EPR)], X-ray diffraction (XRD) analysis, elemental analysis, and conductivity measurement. The complexes have been well characterized based on analytical data. The electrolytic nature of the complexes was determined based on the molar conductance values. The powder XRD pattern has been used to determine crystal size and type. The synthesized Schiff base ligands and oxovanadium(IV) complexes were found to be stable in air and moisture at room temperature. On the basis of the physicochemical data, the tentative geometry of the complexes has been proposed. Antibacterial sensitivity of the ligand and its metal complexes have been assayed in vitro against bacterial pathogens viz. growth inhibitory activity of ligands and complexes against pathogens has also been determined.

Chemical Synthesis, Characterization, and Computational Investigation of Two Schiff Bases Derived From 3-(2-Hydroxyphenyl)-4-amino-4H-1,2,4-triazole-5- thiol and Their Corresponding Oxovanadium(IV) Complexes

“…The cyclic voltammograms for the complexes display the peak-to-peak separation, ΔE p to be ~59 mV and 30 mV for a one-electron and two-electron processes respectively in an ideal reversible scenario [6,12]. But in this study for both ML 1 and ML 2 complexes, the peak-to-peak separation is slightly larger, and the peak current ratio is nearly the same as in the oneelectron ideal reversible process.…”

Syntheses and Catalytic Behavior of Dendritic Macrocyclic Schiff‐Base Nickel (II) Complexes in Ethylene Oligomerization

“…In addition, the absorption peak near 1453 cm −1 was assigned to the −C=C− of the benzene ring skeleton in the ligand. The results only showed that the Schiff base ligands formed, but the difference of the two different Schiff base ligands was characterized difficultly by FTIR [7] …”

“…The results only showed that the Schiff base ligands formed, but the difference of the two different Schiff base ligands was characterized difficultly by FTIR. [7] To further confirm the chemical structure of the ligand obtained in the reaction process and the ligand precipitated from the reaction solution after adding ether, the ligands were characterized by 1 H NMR, 13 C NMR and MS and the results were shown in Figure 2, Figure 3 and Figure 4. 1 H NMR and 13 C NMR spectra of the ligand obtained in the reaction process was consistent with that of the ligand precipitated from the reaction mixture after adding ether and the results were showed in Figure 2 and Figure 3.…”

Effect of indomethacin on the electrical conductance and electrochemical voltammetry of copper chloride in methanol, ethanol, and their binary mixture with water

“…A more stable complex is one that is less likely to dissociate into its component ions, which is indicated by a larger value of (β j ). The complex's behavior under various conditions can be predicted using the stability constants, and experiments can be created to better understand the complex's properties [ [48] , [49] , [50] , [51] , [52] ]. The following Equations 29–31 are used to compute the stability constants (β j ) of the copper complex for each addition : where E° M is the formal peak potential of copper ions at final addition in the absence of indomethacin, E° C is the formal peak potential of the copper complex after each addition of indomethacin, the coordination number of the stoichiometric complex is j, the concentration of indomethacin in the solution is C x , the formal potential is E°, the anodic peak potential is Ep a , the cathodic peak potential is Ep c , the stability constant is β j , and the Gibbs free energy of the interaction between copper ions and indomethacin is ΔG.…”