Journal of the Chemical Society - Faraday Transactions p. 179 - 183 (1996)
Update date:2022-08-16
Topics:
Dhanya
Kumar, Awadhesh
Vatsa
Saini
Mittal
Pola
A time-resolved study of the transients produced in the TEA CO2 or ArF laser-induced decomposition of gaseous silacyclobutane (SCB) and 1,3-disilacyclobutane (DSCB) is reported. Both compounds produce transient H2C=SiH2 as the major primary product which has been identified by its optical absorption spectrum, with λmax ≈ 260 nm. Under conditions of low laser fluence, this species has two decay channels: a unimolecular process (k = 2.3 ± 0.7 × 104 s-1) and a reaction with the parent compound (kSCB = 2.0 ± 0.3 × 10-13 cm3 molecule-1 s-1 and kDSCB = 3.0 ± 0.5 × 10-13 cm3 molecule-1 s-1). At high fluence (7.2 J cm-2 for the CO2 laser and 6 J cm-2 for the ArF laser), the transient absorption signals become very complex owing to the onset of a number of other reactions and the formation of several additional transient species which appear to have strong absorption in the 250-650 nm region, with peaks/shoulders at ca. 260, 320 and 435 nm but these could not be identified unambiguously.
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