Title page for ETD etd-0528102-130208


Type of Document Dissertation
Author Doomes, Edward Earl
Author's Email Address edoomes@lsu.edu
URN etd-0528102-130208
Title X-Ray Spectroscopy of Geometrically Constrained Systems
Degree Doctor of Philosophy (Ph.D.)
Department Chemistry
Advisory Committee
Advisor Name Title
Erwin D. Poliakoff Committee Chair
Britt Thomas Committee Member
Robin McCarley Committee Member
Steve Watkins Committee Member
Anne Grove Dean's Representative
Keywords
  • xanes
  • synchrotron radiation
  • x-ray spectra
  • inner-shell
Date of Defense 2002-05-20
Availability unrestricted
Abstract
Hard X-rays (2 KeV or greater) are used as spectroscopic tools in the characterization of chemical systems. X-ray absorption near edge structure (XANES) spectroscopy is used to characterize multiple groups of chemicals in a systematic fashion. This thesis focuses on chemical systems that in some context have geometrical constraints on their structure. They include self-assembled n-alkanethiol monolayers that are tethered to silver substrates, cyclic sulfides, and (Bis(diphenylphosphino) alkane tetracarbonyl metal complexes. The study of n-alkanethiol monolayers on Ag(111) contains the first observation in the literature of an anomalous resonance in the 18 carbon monolayer. A new interpretation of a subthreshold feature and spectra of improved quality versus previously published work are reported for cyclic polymethylene sulfides. X-ray reflectivity is used to make qualitative assessments of differences in the surface morphology of n-alkanethiol monolayers on silver substrates. The first inner shell excitation spectra of Bis(diphenylphosphino) alkane chromium complexes (alkane=methane, ethane, propane) are presented in addition to the first spectra of Bis(diphenylphosphino) ethane molybdenum and Bis(diphenylphosphino) ethane tungsten. All of these (Bis(diphenylphosphino) alkane tetracarbonyl metal complexes are examined in two ways, at both an inner shell orbital of the metal and at the phosphorus K-edge of the bridging ligand. These studies show that the inner shell X-ray spectra are sensitive to molecular geometry, bond angle, and molecular symmetry over a wide spectral range.
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