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Updated: Feb 10, 2026
12:55
Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies
Published on: November 27, 2013
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Time-Resolved Gas-Phase Kinetic Study of SiD2 + C2H4
Najem Al-Rubaiey1, Robin Walsh2
1Petroleum Technology Department , University of Technology , Baghdad , Iraq.
The Journal of Physical Chemistry. A
|May 10, 2018
Summary
This study measured the reaction rate of deuterium-substituted silylene (SiD2) with ethylene (C2H4). The results show a rapid isotopic scrambling mechanism, similar to its hydrogen counterpart.
Area of Science:
- Chemical Kinetics
- Photochemistry
- Organosilicon Chemistry
Background:
- Silylenes are reactive silicon intermediates.
- Understanding their reaction mechanisms is crucial for silicon chemistry.
Purpose of the Study:
- To determine rate constants for the bimolecular reaction of deuterium-substituted silylene (SiD2) with ethylene (C2H4).
- To investigate the reaction mechanism, including isotopic scrambling.
Main Methods:
- Laser flash photolysis of deuterium-substituted phenylsilane (PhSiD3) to generate SiD2.
- Gas-phase kinetic study over a pressure range of 1-100 Torr using SF6 as a bath gas at 295 K.
- Gas chromatography analysis to identify reaction products.
Main Results:
- Rate constants for SiD2 + C2H4 were pressure-independent.
- The rate constants were similar in magnitude to SiH2 + C2H4 at the high-pressure limit.
- Evidence suggests a rapid isotopic scrambling mechanism, akin to SiH2 + C2D4.
Conclusions:
- The reaction of SiD2 with C2H4 proceeds via a rapid isotopic scrambling mechanism.
- The reaction exhibits similarities to SiH2 + H2 and its isotopic variants.
- Key products like silirane and vinylsilane were not definitively detected under the experimental conditions.
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