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G. P. Zhitneva, Yu. N. Zhitnev
The effect of the
central atom in the molecules C3H5X(CH3)3
on their transformations mechanism under pulse IR-laser action (X: C, Sn, Ge)
Abstract
The effect of the
central atom in the molecules C3H5X(CH3)3 (X:
C, Ge, Sn) on the character of
the intramolecular vibrational energy redistribution and the mechanism of the
chemical transformations is investigated. The analysis of the IR-multiphoton
dissosiation regularities as well as the evaluations using the statistical
theory RRKM (Rise-Ramsperger- Kassel-Markus) have led to the conclusion that the heavy atom (Ge or Sn) hinders the
vibrational energy transfer from the excited group C3H5
to the unexcited one X(CH3)3. It is shown that the change
from atom C to atoms Ge or Sn results in the transition from two-channel
process (C3H5-X bond dissociation and C3H6
elimination) to the one-channel that (C3H5-X bond
dissociation). The reasons of these selective effects are discussed.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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