화학공학소재연구정보센터
Journal of Physical Chemistry A, Vol.102, No.38, 7462-7469, 1998
Kinetic isotope effects in H and D abstraction reactions from alcohols by D atoms in aqueous solution
Electron paramagnetic resonance free induction decay attenuation measurements were performed in the range of liquid D2O for the reactions of D atoms with undeuterated and deuterated alcohols. Excellent Arrhenius behavior represented by log(k/M-1 s(-1)) = (10.97 +/- 0.14) - [(24.7 +/- 0.8) kJ mol(-1)/2.303RT)] for CH3OD, log(k/M-1 s(-1)) = (11.09 +/-0.12) - [(20.8 +/- 0.6) kJ mol(-1)/2.303RT)] for CH3CH2OD, log(k/M-1 s(-1)) = (11.45 +/- 0.10) - [(28.4 +/- 0.6) kJ mol(-1)/2.303RT)] for CD3CD2OD, log(k/M-1 s(-1)) = (11.32 +/- 0.15) - [(21.3 +/- 0.8) kJ mol(-1)/2.303RT)] for CH3CH2CH2OD, log(k/M-1 s(-1)) (11.60 +/- 0.06) - [(21.2 +/- 0.3) kJ mol(-1)/2.303RT)] for(CH3)(2)C(H)OD, log(k/M-1 s(-1)) = (11.48 +/-0.12) - [(24.7 +/- 0.7) kJ mol(-1)/2.303RT)] for(CD3)(2)C(D)OD, was found in all cases. Compared with the gas phase, the reactions exhibit slightly higher activation energies, in agreement with expectation for solvation based on a predicted decrease of the dipole moment from the reactant alcohol to the transition state. A pronounced increase in Arrhenius preexponential factors is attributed mostly to equilibrium solvation of the D atom, but a significant difference between H2O and D2O suggests contributions of a dynamic solvent effect.