Preparation and spectroscopic studies of some nano copper and nickel Schiff base complexes and their applications as colouring pigments in protective paints industry.

Abstract

EW copper (II), nickel (II) Schiff base complexes derived from ………3,3-dimethoxybenzidine and selected aldehydes, namely 2,4-dihydroxybenzaldehyde with the metal salts have been synthesized using a simple technique of microwave method (Green chemistry). The physical properties of prepared ligand and its metal complexes were recorded. The ligand and complexes were characterized using elemental analysis, NM R, infrared and also their geometrical structure were investigated using spectral UV-Vis reflectance, magnetic susceptibility, electron spin resonance (ESR), thermal gravimetric analysis (TGA) and scan electron microscope (SEM ). The performance tests (oil absorption, fineness of grind, moisture content, and pH and bleeding test in different solvents) of the solid metal complexes were explored to ensure that the complexes can be used as a pigments in the field of anticorrosive paints without any compatibility problems in the paint's vehicle. The anticorrosive paints were formulated based on the prepared metal complexes as a pigments and the Physical, mechanical, colour properties and corrosion resistance of dry paint films were also examined. The obtained results revealed that the prepared metal complex pigments showed excellent mechanical, corrosion resistance with colour stability and did not effect or react with the other components in the anticorrosive paint formula.

Metal complexes of Tridentate Schiff base: Synthesis, Characterization, Biological Activity and Molecular Docking Studies with COVID‐19 Protein Receptor

“…which equivalent to the presence of one unpaired electron which is consistent with tetrahedral geometry. This indicated the formation of tetrahedral geometry of the complex [14,26,28,29] …”

Synthesis, Characterization and Antibacterial Activities of New Metal Complexes of Unsymmetrical Tetradentate Schiff Bases

“…The 1 H-NMR.spectra of free ligand at room temperature in DMSO-d 6 shows the following singles (Shelke et al, 2012;Wahba et al, 2017). ForH 2 L 1 :δ=3.25(3H,-CH 3 ),δ=3.25(3H-OCH 3 ), δ=5.64 (2H,phenolic), δ= (6.46-7.25) (13 H, aromatic),δ=8.88 (2H, azomethine).…”

Synthesis, Antibacterial Activity and DFT Calculations of Some Thiazolidine-4-Carboxylic acid Derivatives and Their Complexes with Cu(II), Fe(II) and VO(II)

“…A red shift and overlap of the peaks allowed distinguishing the spectrum of metal complexes, and a charge transfer peaks could be seen in the range of 300-500 nm as well as d-d transitions peaks in the visible region. At 670 and 660 nm, one low intense peak was exhibited by the spectrum of the Cu(II) complexes, which corresponded to transition from 2 T2g → 2 Eg in the characteristic tetrahedral geometry [18]. Magnetic moment values of 1.34 as well as 1.37 B.M.…”