S. Dhanya et al., TIME-RESOLVED STUDY OF THE TRANSIENTS PRODUCED IN THE CO2 AND ARF LASER FLASH-PHOTOLYSIS OF GASEOUS SILACYCLOBUTANE AND 1,3-DISILACYCLOBUTANE, Journal of the Chemical Society. Faraday transactions, 92(2), 1996, pp. 179-183
Citations number
24
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
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 i
ts optical absorption spectrum, with lambda(max) approximate to 260 nm
. Under conditions of low laser fluence, this species has two decay ch
annels: a unimolecular process (k = 2.3 +/- 0.7 x 10(4) s(-1)) and a r
eaction with the parent compound (k(SCB) = 2.0 +/- 0.3 x 10(-13) cm(3)
molecule(-1) s(-1) and k(DSCB) = 3.0 +/- 0.5 x 10(-13) cm(3) molecule
(-1) s(-1)). At high fluence (7.2 J cm(-2) for the CO2 laser and 6 J c
m(-2) for the ArF laser), the transient absorption signals become very
complex owing to the onset of a number of other reactions and the for
mation of several additional transient species which appear to have st
rong absorption in the 250-650 nm region, with peaks/shoulders at ca.
260, 320 and 435 nm but these could not be identified unambiguously.