Authors : Fadila Djabi and Fatiha Benghanem
Abstract: The interaction of ligands 2-mono(dihydroxyphosphonyl) methyl 4-nitro 6-methyl phenol (P2N4M6) and of 2-mono(dihydroxyphosphonyl) methyl 4,6-dinitrophenol (P2N4.6) with 3 metal ions, Al(III) Cr(III) and Fe(III) was studied . By means of potentiometry, the stability constants of the complexes formed were calculated at 25.0 � 0.1�C. The ionic strength was maintained at 0.1 M with an aqueous solution of NaClO4. Complexes of 1:1 metal to ligand ratio are formed and the logarithmic values of the stability constants of the model ML are: For P2N4M6: Al(III) = 7.99; Cr(III) = 6.30; Fe(III) = 6.70. For P2N4.6: Al(III) = 6.72; Cr(III) = 7.45; Fe(III) = 6.19. The stability of the 2 ligands is compared and a further comparison of the complexing ability with other ligands is attempted.
Fadila Djabi and Fatiha Benghanem , 2007. Potentiometric Study of the Complexing Ability of 2-Mono(Dihydroxyphosphonyl) Methyl 4-Nitro 6-Methyl Phenol (P2N4M6) and of 2-Mono(Dihydroxyphosphonyl) Methyl 4, 6-Dinitrophenol (P2N46) with Metal Cations Al(III), Cr(III) and Fe(III) . Journal of Engineering and Applied Sciences, 2: 828-832.