Rates of hydrated electron reactions with undissociated carboxylic acids
Affiliation:
1. Laboratory: Mathematics, Computer Science and Engineering Sciences, Faculty of Science and Technology, University Hassan I, B.P. 577, 26000 Settat, Morocco;2. TRIUMF, Life Sciences Division, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada;3. Department of Radiotherapy, Sheikh Khalifa International University Hospital, BP 82403 Casa Oum Rabii, Hay Hassani Boulevard Mohamed Taieb Naciri, Casablanca, Morocco;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. School of Mechatronics, Harbin Institute of Technology, Harbin 150001, China;1. Department of Gastroenterology of Zhongshan Hospital, Fudan University, Shanghai, China;2. Institute of Endoscopic Research of Zhongshan Hospital, Fudan University, Shanghai, China
Abstract:
The rate constants for the reaction series RCOOH+eaq−, with different substituents R (H, CH3, C2H5, CHO, CH2OH, CH3CHOH, C6H5, CH2COOH, (CH2)2, COOH, CH2COO−) have been determined by steady-state competition kinetics. The competing reaction was the reaction of the hydrated electron with the hydronium ion. The effect of the substituents on the rate constants was shown to be mainly of the inductive type. The reaction rates can be correlated by means of Taft's equation with positive slope ϱ∗= 1·94±0·15 role=presentation style=font-size: 90%; display: inline-block; position: relative;>. As expected, significant deviations are observed in the cases in which other interactions besides inductive ones are possible. H atoms are not formed in these reactions. In the case of formic, acetic and propionic acids reactions proceed in two paths at comparable rates. H atoms are formed as a product in one of them.
