Summary: Up to now silylenium and nitrenium cations have been
studied only indirectly by means of product analysis and kinetic
measurements. The attempts to prepare them in supreacidic media in liquid
phase also failed. In these investigations we will apply our method for
matrix isolation to study the carbocations having silicon and nitrogen
atoms in close vicinity of the positively charged carbon. We hope, that
under these experimental conditions the silicon substituted vinyl, allyl
and propargyl cations can be isolated and studied by IR spectroscopy.
Research goals: 1. To investigate the stability of silylenium and
nitrenium cations and similar intermediates in super acidic medium. 2. To
work out the most convenient method for their isolation 3. To investigate
their activity by measuring (spectroscopically) the electronic effects
responsible for chemical behaviour. 4. To determine vibrational structures
of these cations and/or similar species. 5. To study the relationship
between vibrational structure and chemical reactivity in cases when these
ions and similar species are perturbed by strong chemical agens. Other information about the project.