Relative reaction rate involving thermal fluorine-18 atoms and thermal fluoroethyl radicals with oxygen, nitric oxide, sulfur dioxide, nitrogen, carbon monoxide, and hydrogen iodide

Abstract

The reactions of thermal 18F atoms have been studied with O2, NO, SO2, N2, and CO in competition with addition to C2H2 or C2H4. Addition to C2H4 is 0.83 ± 0.02 as rapid, and total reaction with SO2 is 0.04 ± 0.02 as fast as addition to acetylene. The reaction rates with the molecules O2, NO, N2, and CO are all <0.01 vs. addition to acetylene, at about 4000 Torr. The relative rates of reaction of CH218FCH2 radicals with various scavengers are HI, (1.0); NO, 5.0 ± 0.5; O2, 1.05 ± 0.10; SO2, 0.33 ± 0.10; CO, 0.005 ± 0.002. For CH18F=CH radicals, the relative rates are HI, (1.0); CO, 0.Ó22 ± 0.007; N2, <0.003.

Absolute Rate Constants for the Reactions of F(2P) with C2H2 and C2H4 at T = 298 K

“…is pressure independent. Table 3 shows that there is good agreement between our absolute value k2 = 2.7 X cm3 molecule-' s-1 obtained at pressures of 1 Torr of He and the value k2 = 2.4 X 10-10cm3 molecule-' s-1 obtained from the sum of the relative values for k(addition) 8 …”

Reactions of iodine with olefins. 4. Preferential site attack of electrophilic high energy iodine in gaseous, high pressure, and liquid butene-1

“…The complete quenching of the 1-iodopropane yield by 02 addition suggests that formation by direct substitution (6) is not a major consideration. Complexation followed by decomposition (8,12) is also, at best, of minor importance in light of the increase in product yield observed with increasing pressure. The complementary reaction to radical formation of CH3I, reaction 1, suggests that the substitution of I for the methylene group in butene-1 would result in the proper pressure dependence and be radical in nature.…”

Spectroscopic studies of some laser dyes

“…carried out which unambiguously involve the reactions of atomic fluorine with aromatic systems despite the considerable interest in such reactions.2 345However, radioactive 1SF atoms (tv, = 110 min) can be produced by various nuclear reactions, including the 19F(n,2n)18F reaction with fast neutrons, and these atoms can be brought to thermal energies without bond formation by multiple collisions with suitable inert moderators. [3][4][5][6][7][8][9][10][11][12][13][14][15] In the last several years, research in this laboratory has utilized such thermal 18F atoms for reaction studies with olefins,6•7•9•10 acetylene,8 various RH compounds,11 and a variety of inorganic species.12•13…”