MacLean, Brian (2002) Conjugated metallopolymers containing 2,2'-bithiazole. Doctoral (PhD) thesis, Memorial University of Newfoundland.
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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))|
|Additional Information:||Bibliography: leaves 182-188.|
|Department(s):||Science, Faculty of > Chemistry|
|Library of Congress Subject Heading:||Metal-filled plastics; Bioconjugates|
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