Date of Award
Chemistry and Biochemistry
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Herein I report the synthesis of a new family of organometallic reduced mesoporous niobium oxide composites with mixed oxidation-state organometallic nanowires in the pores and investigate their electronic and magnetic properties. This is a wonderful system which allows us to systematically study one-dimensional molecular metals based on the respective organometallic species and the reducible mesoporous niobium oxide structure. Investigations were conducted on the effects of electron configuration, ionization potential, and electron affinity of organometallic species as well as the composition of mesoporous transition metal oxide walls on the electronic and magnetic properties in the composites and the loading level of organometallics. Results obtained in this work showed the treatment of mesoporous niobium oxide with bis(benzene)chromium, bis(benzene)vanadium, bis(cyclopentadienyl)vanadium, bis(cyclopentadienyl)chromium or decamethylsamarocene led to semiconducting materials with mixed oxidation-state organometallic phases in the pores. The conductivity was as high as 10-4 ohm-1cm -1. The mixed oxidation-state organometallic phase was found playing a main role on the conductivity which was attributed to the oxidation-induced molecular orbital holes in the organometallic phase. The Hubbard model was successfully applied to this new family of materials in an effort to understand the origin of conductivity. Materials in this work were characterized by a combination of techniques including XRD, nitrogen adsorption, EPR spectroscopy, XPS, SQUID magnetometry, room temperature DC conductivity measurements, NMR, and elemental analysis.Dept. of Chemistry and Biochemistry. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2002 .H45. Source: Masters Abstracts International, Volume: 41-04, page: 1080. Adviser: David Antonelli. Thesis (M.Sc.)--University of Windsor (Canada), 2002.
He, Xun., "Synthesis and electronic, magnetic properties of low-dimensional organometallic reduced mesoporous niobium oxide composites." (2002). Electronic Theses and Dissertations. 3690.