The rates of reaction, Arrhenius preexponential factors, and activation energies of CH 2 FCH 2 F (HFC-152) and CH 3 CHF 2 (HFC-152a) for the abstraction reaction with hydroxyl radical were measured by a relative rate method. Temperature ranges were 287-409 and 286-403 K, respectively. Reference compounds for both reactants were ethane (k ) 1.00 × 10 -11 e -1094/T cm 3 molec. -1 s -1 ) and cyclopropane (k ) 7.28 × 10 -12 e -1356/T cm 3 molec. -1 s -1 ). Also, the JPL 97-4 recommendation for HFC-152a (k ) 2.4 × 10 -12 e -1260/T cm 3 molec. -1 s -1 ) was used as a reference for HFC-152 vs 152a experiments. For HFC-152, the combined results yielded an Arrhenius expression of k ) 3.55 × 10 -12 e -1084/T cm 3 molec -1 s -1 . The result for HFC-152a was k ) 1.86 × 10 -12 e -1183/T cm 3 molec -1 s -1 . For both reactants, uncertainties in k(298 K) and E/R are believed to be less than 10% and 100 K, respectively. The experimental results are compared with predicted values based on previously observed group effects as well as the dependence of preexponential factors on the magnitude of the rate constant. The results are also compared to previously published values for these same compounds obtained by absolute methods.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.