Dissociation constants of organophosphinic acid compounds.
The dissociation equilibria of di(2,4,4-trimethylpentyi) phosphinic acid, mono(2,4,4-trimethylpentyl) phosphinic acid, di(n-octyl)phosphinic acid and mono(n-octyl)phosphinic acid have been studied in ethanol-water mixtures by potentiometric titration at 25 degrees C. These data have been analysed both graphically numerically using the program LETAGROP-ZETA. The obtained pK(a) values have been correlated with the corresponding values in water, determined both indirectly by means of extraction measurements and by estimation using the suitable Hammett equation.
Martinez
M
M
Chemical Engineering Department, Universitat Politècnica de Catalunya, E.T.S.E.I.B., Avda. Diagonal 647, Barcelona, Spain.
Miralles
N
N
Sastre
A
A
Bosch
E
E