𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The dark reactions F2 + CF3I, C2F5I, and n-C3F7I

✍ Scribed by D. E. Johnson; E. A. Walters; E. A. Dorko

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
909 KB
Volume
28
Category
Article
ISSN
0538-8066

No coin nor oath required. For personal study only.

✦ Synopsis

The reactions between F2 and the lowest members of the homologous series of perfluoroalkyl iodides (CF31. C2F51. and n-C3F71) have been studied. For these compounds, an exponential decrease in the alkyl iodide concentration over time following an induction period is observed for certain experimental conditions Other conditions lead to chaotic-like kinetic behavior where the rate of alkyl iodide consumption continually changes. Kinetic rate data with CF31 show that the disappearance rate depends upon both the type of surface and surface preparation For all three compounds. Arrhenius plots reveal activation energies on the order of 10 kcal/mol, consistent with effective initiation steps of F2 + RI -RIF + F. where R represents the CF3, C2F5, or n-C3F, radical, respectively The end products of the F2 + RI reactions are RF. Rz. and IF5. suggesting that the R radicals play an important kinetic role.

Introducing O2 into the F2 + RI reaction systems results in successive oxidation of R by 02, leading to the formation of CFIO as an additional end product IF(B -X ) emission is observed from the RI-rich F2 + RI reactions, confirming the existence of IF as an intermediate.

📜 SIMILAR VOLUMES

Gas phase reactions of CF3, C2F5, and n-
Gas phase reactions of CF3, C2F5, and n-C3F7 with carbon tetrachloride
✍ C. M. de Vöhringer; E. H. Staricco 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 245 KB

The reactions of some perfluoroalkyl radicals with carbon tetrachloride have been studied using the photolysis of the corresponding perfluoroalkyl iodide as the free radical source. The Arrhenius parameters, based on the value of 2.3 x 1013 cm3 mol-' s-' for the self-combination rate constant of all

Syntheses and Characterization of (C2F5)
Syntheses and Characterization of (C2F5)3BCO and (C3F7)3BCO
✍ Michael Gerken; Gottfried Pawelke; Eduard Bernhardt; Helge Willner 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 447 KB

bond lengths are 1.109(2) and 1.103(5) , respectively, which are among the shortest observed to date. Tris(pentafluoroethyl)borane carbonyl and (C 3 F 7 ) 3 BCO slowly decompose at room temperature to yield CO, difluoroperfluoroalkylboranes and perfluoroalkenes. The decomposition of (C 2 F 5 ) 3 BCO

Laser-induced chemical kinetics: Absolut
Laser-induced chemical kinetics: Absolute rate constants for the reactions Ċ2F2 + Br2 → C2F5Br + Ḃr and n-Ċ3F7 + Br2 → n-C3F7Br + Ḃr
✍ M. J. Rossi; J. R. Barker; D. M. Golden 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 332 KB

Absolute rate constants a t room temperature for the metathesis reaction C~FS + Br2 C2FSBr + Br and nd3F7 + Br2 CzFTBr + Br have been measured under V L P P conditions: The radicals were generated through collisionless infrared-multiphoton decomposition of the corresponding iodides by irradiation f

The kinetics of the reactions of i-C3F7
The kinetics of the reactions of i-C3F7 radicals with BR2 and HBr
✍ Ian Weeks; Eric Whittle 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 English ⚖ 256 KB 👁 2 views

The reactions (2) (3) have been studied competitively in the vapor phase over the range of 52-204°C. The i-C3F7 radicals were generated by means of the reaction It was found that log kz/k3 = (0.55 f 0.07) + (10,870 f 560)/0 where 0 = 2.303RT J/mol. Absolute Arrhenius parameters are derived for the