Date of Award

Spring 2007

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Chemistry

Abstract

The chemistry of reactive intermediates is central to a modern mechanistic and quantitative understanding of organic chemistry. Moreover, it underlies a significant portion of modem synthetic chemistry, and is frequently integral to a molecular view of biological chemistry. Two important classes of intermediates, halogenated carbenes and carbocations have been investigated for many years. Carbenes have unusual electronic properties, caused by the interactions of two non-bonding carbon-centered electrons. The extreme sensitivity of electronic energy to substitution, and its effect on the reactivities of these species have attracted a particular attention of the spectroscopists. As a-result, many attempts have been made to obtain detailed and precise information about the structure of both the ground and the first excited states. Although there have been many attempts to describe the halogenated carbenes, carbocations have been less studied because of the problems with the production in the experimental conditions. But it is rather hard to exclude the carbonations from the scope of the investigation due to their presence in the atmosphere as products of different reactions that can affect dramatically the human beings. The report treats the results obtained in Laser-induced Fluorescence studies ofCBr2 and CH2r+. In the case of CBr2 carbene the work is focused on the electronic spectroscopy, lifetimes and barrier to linearity in the A, B X A, system. At this point we are presenting the excitation and emission spectra of CH2I and a comparison of the single vibronic level emission spectra of CD2I, CHDI, and CH2I obtained by the excitation of their origin bands.

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