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Complexing behaviour of three dihydroxybenzenes (DHB) namely, hydroquinone, resorcinol and catechol with Th(IV) along with their protonation constants were studied in 1 M NaClO 4  medium at 23 ± 0.5 °C, using pH titration technique. Both protonation and metal-ligand equilibrium constants of dihydroxybenzenes were computed using advance software suite of program HYPERQUAD. Logarithmic values of overall protonation constants (log β 1H  and log β 2H ) were found to be 11.47 ± 0.05 and 21.45 ± 0.06, for hydroquinone, 11.76 ± 0.04 and 20.98 ± 0.04 for resorcinol and 12.58 ± 0.03 and 21.87 ± 0.08 for catechol respectively. Complex formation has been investigated in the pH range 2 to 4. The logarithmic values of metal-ligand equilibrium constants obtained in the present work were β 13-1 =48.51 ± 0.67 and β 14-1 =64.86 ± 1.25 for hydroquinone, β 110 =16.98 ± 0.16, β 13-1 =46.46 ± 0.18 and β 14-2 =59.65 ± 0.20 for resorcinol and β 11-1 =14.06 ± 0.10 for catechol. The literature values were reviewed.

Studies on protonation and Th(IV) complexation behaviour of dihydroxybenzenes in aqueous 1 M NaClO 4 medium