Fadila Djabi  , Fatiha Benghanem  , 
    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,
    Volume 2,Issue 5,
    2007,
    Pages 828-832,
    ISSN 1816-949x,
    jeasci.2007.828.832,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2007.828.832)
    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 NaClO<SUB>4</SUB>. 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.
    Keywords: Dihydroxyphosphonyl phenols;P2N4M6;P2N4.6;potentiometry;stability constants; complexing ability