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Title: Kinetics of C2H reactions with hydrocarbons and nitriles in the 104-296 K temperature range
Journal: J. Phys. Chem. A
Volume: 108
Page(s): 1746 - 1752
Year: 2004
Reference type: Journal article
Squib: 2004NIZ/LEO1746-1752
Reaction:
CH3CN + ·C2H → Products
Reaction order:
2
Temperature:
165 - 360
K
Pressure: 1.90E11 - 2.60E12 bar
Rate expression:
1.8x10-11 [±3.5x10-12 cm3/molecule s] e-6369 [±316 J/mole]/RT
Category: Experiment
Data type:
Absolute value measured directly
Pressure dependence:
None reported
Experimental procedure:
Static or low flow - Data taken vs time
Excitation technique:
Flash photolysis (laser or conventional)
Time resolution:
In real time
Analytical technique:
Chemiluminescence
Comments:
C2H was generated via the pulsed laser photolysis of C2H2 at 193 nm and the decay of C2H monitored in the presence of the substrate of interest. C2H was monitored by adding a small amount of O2 to the system and observing the chemiluminescence produced by the C2H + O2 reaction. Low temperature experiments were carried out by using a pulsed Laval nozzle, while for room temperature studies the nozzle was bypassed.
The reaction can procede via both H abstraction and addition to the triple bond, but the branching ratio is unknown.
For several substrates (isobutene, and methyl, ethyl, and propyl cyanides), the possible pressure dependence of the reaction was investigated at room temperature over the range of 0.6-8.0 Torr. No dependence was observed.
Uncertainties are 2 standard deviations. The Arhenius parameters were derived after inclusion of results at 262 and 360 K from a previous work (Hoobler, R. J.; Leone, S. R. J. Geophys. Res., [Planets] 1997, 102, 28717.)
View full bibliographic record.
Rate constant values calculated from the Arrhenius expression:
| T (K) | k(T) [cm3/molecule s] |
|---|---|
| 165 | 1.73E-13 |
| 175 | 2.26E-13 |
| 200 | 3.91E-13 |
| 225 | 5.98E-13 |
| 250 | 8.41E-13 |
| 275 | 1.11E-12 |
| 300 | 1.40E-12 |
| 325 | 1.70E-12 |
| 350 | 2.02E-12 |
| 360 | 2.14E-12 |