Synthesis, Spectral Characterization and Antimicrobial Activity of Some Transition Metal Complexes with new Schiff Base Ligand (BDABI)

Abstract

A new Schiff base derivative ligand (LI) have been produced by condensed isatin and 2,3-diaminobutane (2:1) molar ratio. The (LI) ligand has been separated and distinguished by 1 H, 13 C-NMR, (CHN) elemental analysis, UV-visible, mass spectroscopy and Fourier Transform infrared (FTIR) methods. The metal ions, cobalt(II), nickel(II) and copper(II) complexes were synthesized with the ligand. The complexes were typified by, UV-Visible, FTIR, atomic absorption, molar conductance, magnetic susceptibility and elemental analysis (CHN) techniques. Octahedral geometry are suggested for the metal complexes based on the results of physico-chemical and spectral techniques. The TLC for (LI) ligand and complexes demonstrated single spot for each, signifying their compounds purity. All these compounds were determined aligned with two classes of human pathogenic; bacteria Gram positive and Gram negative.

New complexes of manganese (II) and copper (II) derived from the two new furopyran-3, 4-dione ligands: Synthesis, spectral characterization, ESR, DFT studies and evaluation of antimicrobial activity

“…It consists of four hyperfine lines attributed to the interaction of the single electron with the Cu nucleus (I = 3/2). The values obtained for all the parameters show that the spectra of the two complexes have an axial symmetry with: g// > g ⊥ > 2,0023, this order is typical of monomeric Cu (II) complexes and indicates that the single electron is located on the orbital d x2-y2 of the Cu (II) ion and confirmed an octahedral geometry [60][61][62]. To better define the nature of the links formed, several Bonding parameters α 2 (covalent in-plane δ-bonding), β 2 (covalent in plane π-bonding) and γ 2 (covalent out of plane π -bonding) were evaluated using the following formulas:…”

Preparation and characterization of new Mixed ligand complexes For some transition metal ions (bivalent) with Schiff- Mannich and Schiff base ligands

“…The free ligands spectra were red-shift in complexes, proposing an octahedral geometry around metallic complexes as showed in Fig. (15) and (16) . All these data were listed in Table (5) shows the transition of electronic spectra for the ligands L1,L2,L3 and their metallic mixed ligand complexes in DMSO solvent.…”

“…In the second step of preparing the L3 Schiff base, (0.01 mol, 2.933 gm) of the compound prepared in step (3.1) (DMAA) was dissolved in (50) ml of absolute ethanol and (0.01mol, 1.47 gm) of dissolved Isatin was added to it in (50) ml of absolute ethanol and (2-3) drops of glacial acetic acid, and the mixture rose for thirty hours [16] , then it turned brown. It was left to cool, and the ligand (L3) precipitated in the form of a brown solid.…”