Relevant articles and documents
Kinetics of hydrolysis in aqueous solution of 1-benzoyl-1,2,4-triazole; the role of pairwise and triplet Gibbs energy interaction parameters in describing the effects of added salts and added alcohols
Noordman, Wouter H. Blokzijl, Wilfried Engberts, Jan B. F. N. Blandamer, Michael J.
Kinetic data are reported for the spontaneous hydrolysis of 1-benzoyl-1,2,4-triazole in aqueous solutions at ambient pressure and 298.2 K, in aqueous solutions containing added ethanol, propanol and sodium chloride.Kinetic data are also reported for the same reaction in aqueous mixtures of sodium chloride and ethanol.When either ethanol or propanol are added the rate constant k decreases, plotes of ln(k) vs. molality of alcohol being linear.The patterns are accounted for using pairwise Gibbs energy interaction parameters.The rate constant k decrease more dramatically when sodium chloride is added.This pattern is accounted for using pairwise and triplet interaction parameters.The dependence of rate constant on molality of added ethanol in solutions containing fixed molalities of sodium chloride deviaties from that predicted using the pairwise interaction parameters indicating a non-additivity of salt and alcohol effects on the rate constant.The deviations increase wirh increase in molalities of both added salt and added solvent in a direction consistent with a disruption of the substrate-alcohol hydrophobic interactions by added salt.
SURFACTANT-POLYMER INTERACTIONS AND THEIR EFFECTS ON THE MICELLAR INHIBITION OF THE NEUTRAL HYDROLYSIS OF 1-BENZOYL-1,2,4-TRIAZOLE.
Fadnavis Engberts
Binding of sodium dodecyl sulfate (SDS) to atactic poly(N-vinylpyrrolidone) (PVP) has been studied by conductivity measurements. It is proposed that in addition to normal micelles of SDS an additional pseudophase of mixed micelles of PVP and SDS is present in solution. The effect of polymer-surfactant binding on the catalytic/inhibitive activity of SDS micelles has been investigated by studying the rates of the pH-independent hydrolysis of 1-benzoyl-1,2,4-triazole (1). Though the polymer itself has no effect on the hydrolysis reaction in water, addition of PVP to SDS solutions decreases the micellar inhibition, and pseudo-first-order rate constants (k//o//b//s//d) are higher than those in the absence of PVP. Ultrafiltration experiments using a model substrate indicate increased solubility of the substrate in the micellar pseudophase upon addition of PVP.
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