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Digitale Medien

Activation parameters and kinetic isotope effect in the system tropaeolin O-OH- (1978)

Perlmutter-Hayman, Berta ; Shinar, Ruth

New York, NY : Wiley-Blackwell

International Journal of Chemical Kinetics 10 (1978), S. 407-415

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Details

ISSN: 0538-8066

Schlagwort(e): Chemistry ; Physical Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The kinetics of the deprotonation of tropaeolin O by OH- ions was investigated between 9° and 30°C, and by OD- ions at 24.7°C. The pH range was 10.7-12.5, and the ionic strength 0.1M throughout. All results were obtained by the temperature jump method. On the basis of a mechanism suggested earlier, rate constants k31 for the reaction between OL- and the internally bonded weak acid and k32 for the opening of the internal hydrogen bond were evaluated. The activation energies in ordinary water were found to be ΔH≠31 = 3.6 kcal/mol, ΔS≠31 = -19 eu, and ΔH≠32 = 27 kcal/mol, ΔS≠32 = 46 eu. The kinetic isotope effect was k31H2O/k31D2O ∼ 1.5 and k32H2O/k32D2O ∼ 0.9. The unusual results for reaction path are discussed in terms of solvent participation.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/kin.550100406

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