RATE-CONSTANT AND ACTIVATION-ENERGY DETERMINATION FOR REACTION OF E(-)(AQ) AND (OH)-O-CENTER-DOT WITH 2-BUTANONE AND PROPANAL

The techniques of pulse radiolysis and absorption spectroscopy have be en used to determine kinetic parameters for e((aq))(-) and .OH reactio n with 2-butanone and propanal. The temperature dependent rate constan ts for hydrated electron reaction are given by ln k(T) = (28.96 +/- 0. 06) - (1970 +/- 20)/T (2-butanone, 275-343 K), and In k(T) = (29.2 +/- 0.2) - (2160 +/- 50)/T (propanal, 275-310 K), where the given uncerta inties are 1 sigma and only represent precision, and the rate constant s are in units of M(-1) s(-1). For hydroxyl radical reaction over the same temperature ranges, ln k(T) = (25.32 +/- 0.02) - (1460 +/- 40)/T (2-butanone) and ln k(T) = (32.73 +/- 0.03) - (3310 +/- 100)/T (propan al).