Conjugated metallopolymers containing 2,2'-bithiazole

MacLean, Brian (2002) Conjugated metallopolymers containing 2,2'-bithiazole. Doctoral (PhD) thesis, Memorial University of Newfoundland.

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    Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
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Abstract

Ruthenium and osmium conjugated metallopolymers containing a bithiophene-co-bithiazole backbone have been synthesized and their electrochemistry investigated. This relatively new class of materials has demonstrated enhanced rates of charge transport relative to redox metallopolymers in which a saturated organic network connects pendant metal complexes. Applications requiring fast electrochemistry, such as molecular switching and electrocatalysis, clearly can benefit from this enhancement. -- Electropolymerization from boron trifluoride dethyletherate (BF₃ OEt₂) permitted facile deposition of polymer films for electrochemical experiments. Impedance spectroscopy has been used to investigate electron transport rates in these metallopolymers. DcCM² was found to be over 20 times greater in poly-[Ru(5,5'-bis(2-thienyl)-2,2’-bithiazole)(bpy)₂³⁺/²⁺] than in poly-[Ru((6,6'-bibenzimidazole-2,2’-diyl)-2,5-pyridine)(bpy)₂³⁺/²⁺] as a result of better energy matching of the ruthenium t₂g orbital with the HOMO band in the poly[5,5'-bis(2-thienyl)-2,2'-bithiazole] backbone. A hole-type mechanism of superexchange is proposed for this system.

Item Type: Thesis (Doctoral (PhD))
URI: http://research.library.mun.ca/id/eprint/1208
Item ID: 1208
Additional Information: Bibliography: leaves 182-188.
Department(s): Science, Faculty of > Chemistry
Date: 2002
Date Type: Submission
Library of Congress Subject Heading: Metal-filled plastics; Bioconjugates

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