The monomer 5-(4-acryloyloxyphenylazo)-salicylaldehyde [5, was prepared and polymerized in dimethylformamide (DMF) at 70 C using benzoyl peroxide as free radical initiator. Poly5-(4-acryloyloxyphenylazo) salicylaldehyde [poly(5,4-APASAL)] was characterized by infrared and nuclear magnetic resonance spectroscopic technique. The molecular weight of the polymer was determined by gel permeation chromatography method. Cu(II), Ni(II), Cr(III), and Cr(VI) complexes of poly(5,4-APASAL) were prepared. Elemental analysis of polychelates suggests that the metal to ligand ratio is about 1 : 2. The polymer metal complexes were also characterized by XRD, magnetic moment, and thermal analysis. The effect of pH and electrolyte concentration in the metal uptake behavior of the polymer was also studied.
The polymeric ligand (resin) was prepared from 1-(4-hydroxyphenylazo)-2-naphthol (4HPA2N-F) with formaldehyde in the presence of oxalic acid as a catalyst. Poly (4HPA2N-F) was characterized by Fourier transform infrared and 1 H-NMR spectroscopic techniques. The molecular weight of the polymer was determined by gel permeation chromatography. Polychelates were obtained when the dimethylformamide solution of the polymer containing a few drops of ammonium hydroxide was treated with a aqueous solution of Cu(II)/Ni(II). The Infrared spectra of polychelates suggest that the metals were coordinated through the oxygen of the phenolic-OH group and nitrogen of the azo group. The thermogravimetic analysis, differential scanning calorimetry and X-ray diffraction studies indicate that the incorporation of the metal ion significantly enhanced the degree of crystallinity. The sorption properties of the chelate-forming polymer towards various metal ion Cu(II) and Ni(II) were studied as a function of pH, nature and concentration of electrolytes. The antibacterial activities of polymer and its metal complexes against several microorganisms were also investigated by using agar well diffusion method.
A chelating polymer poly(2-hydroxy-4-methacryloyloxy benzaldehyde hydrazone) poly(2H4MBH) was prepared in N,Ndimethylformamide (DMF) at 70 C using benzoyl peroxide as initiator. Poly (2H4MBH) was characterized by infra-red and 1 H-NMR spectroscopic techniques. The molecular weight of the polymer was determined by gel permeation chromatography. Polychelates were obtained when the DMF solution of the polymer containing a few drops of ammonia was treated with the aqueous solution of Cu(II)/Ni(II). Elemental analysis of the polychelates indicates that the metal-ligand ratio was about 1: 2. The infrared spectra of polychelates suggest that the metals were coordinated through the oxygen of the phenolic-OH group and nitrogen of the azomethine group. The EPR (Electron paramagnetic resonance) and magnetic moment data indicate a square planar structure for Cu(II) complex whereas octahedral structure for Ni(II) complex. The thermogravimetric analysis, differential calorimetry, and X-ray diffraction data indicated that the incorporation of the metal ions significantly enhanced the degree of crystallinity. The sorption properties of the chelate-forming polymer towards various divalent metal ions Cu(II) and Ni(II) were studied as a function of pH, nature, and concentration of electrolytes.
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