The kinetics of the decomposition of 4-nitrophenyl diethylphosphonate and 4-nitrophenyl diethyl phosphate by the H2O2/B(OH)3/HO– system with wide variation of the pH and the initial concentrations of H2O2 and B(OH)3 (water, 25°C) was studied. Additions of boric acid either weakly accelerate the reaction or retard it, depending on the ratio of the initial concentrations of hydrogen peroxide and boric acid and on the nature of the substrate. The peroxoborate anions (HO)3BOOH–, (HO)2B(OOH) –2 , and (HO)3BOOB(OH) 2–3 anions generated by this system do not affect the decomposition rate of the substrates. In both substrates linear relationships were found between the observed rate constants k and the concentrations of peroxide anion.
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Notes
The equilibrium constant was determined for μ = 0.1 M and 25°C. (In the case of K 2 the ionic strength was maintained with NaClO4, and in the case of K 3, K 4, and K 5 with KNO3.)
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Translated from Teoreticheskaya i Éksperimental’naya Khimiya, Vol. 48, No. 3, pp. 152-158, May-June, 2012.
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Sadovskii, Y.S., Solomoichenko, T.N., Prokop’eva, T.M. et al. Reactivity of the H2O2/B(OH)3/HO- system in the decomposition of 4-nitrophenyl esters of diethylphosphonic and diethylphosphoric acids. Theor Exp Chem 48, 163–171 (2012). https://doi.org/10.1007/s11237-012-9256-8
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DOI: https://doi.org/10.1007/s11237-012-9256-8