Polyhalogenated benzenes have been analyzed by standard electron capture
chemical ionization mass spectrometry (ECCI/MS), and electron monochromator mass
spectrometer (EM/MS) systems. The EM/MS experiments distinguished electronegative
compounds (especially isomers) by transient negative ions (TNIs) of the same mass but
differing energies and/or the formation of distinct TNIs of different masses for each
electronegative compound. The ECCI/MS results of polybrominated benzenes show that
"bromine addition" and hydrogen abstraction reactions occur to form ions with one to three
bromines added to the starting material. Computations have given insight into the
mechanisms that may be involved in the EM/MS and ECCI/MS experiments. Calculations
have also provided qualitative support for the processes that may be occurring in the
ECCI/MS experiments, and in non-photochemical and photochemical reactions of
polyhalogenated benzenes. Photochemical experiments reveal that a minor, but notable
pathway that involves an "iso-polychlorobenzene intermediate", is taking part in the photo-dehalogenation
of chlorobenzene and hexachlorobenzene. / Graduation date: 2000
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/33242 |
| Date | 20 July 1999 |
| Creators | Herbelin, Sharon Maley |
| Contributors | Freeman, Peter K. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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