Kinetic studies of the reactions of hydroxyl radicals with the methyl-substituted silanes SiHn(CH3)4 − n (n=0 to 4) at room temperature

✍ Scribed by A. Goumri; Jessie Yuan; Elizabeth L. Hommel; Paul Marshall

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 258 KB
• Volume: 375
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)00857-1

✦ Synopsis

The flash-photolysis resonance-fluorescence method has been employed at 293-297 K to measure rate constants for the reactions of OH with SiH 4 , Si(CH 3 )H 3 , Si(CH 3 ) 2 H 2 , Si(CH 3 ) 3 H, and Si(CH 3 ) 4 of (1.2 AE 0.2) Â 10 À11 , (3.3 AE 0.4) Â 10 À11 , (4.4 AE 0.5) Â 10 À11 , (3.1 AE 0.4) Â 10 À11 , and (1.2 AE 0.2) Â 10 À12 molecule À1 cm 3 s À1 , respectively. The uncertainties are 95% confidence intervals (see text). The results reveal that the per Si-H bond reactivity towards OH increases with the degree of methylation, and that Si(CH 3 ) 2 H 2 is the most reactive member of the series.