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I. Ground-state association between phenothiazine and tris(diimine)ruthenium(II) complexes: its role in highly efficient photoinduced charge separation. II. Ligand modifications of cobalt complexes to increase efficiency of electron-transfer mediators in dye-sensitized solar cells

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dc.contributor.authorWeber, John, author
dc.contributor.authorElliott, C. Michael, advisor
dc.contributor.authorRappe, Anthony, committee member
dc.contributor.authorLevinger, Nancy, committee member
dc.contributor.authorWoody, Robert, committee member
dc.contributor.authorVan Orden, Alan, committee member
dc.date.accessioned2007-01-03T08:08:57Z
dc.date.available2007-01-03T08:08:57Z
dc.date.issued2012
dc.description.abstractSupramolecular triad assemblies consisting of a central trisbipyridineruthenium(II) chromophore (C2+), with one or more appended phenothiazine electron donors (D) and a diquat-type electron acceptor (A2+) have been shown to form long-lived photoinduced charge separated states (CSS) with unusually high quantum efficiency. Up to now, there has been no explanation for why such large efficiencies (often close to unity) are achieved from these systems when other, seemingly similar, systems are often much less efficient. In the present study, using a bimolecular system consisting of chromophore-acceptor diad (C2+-A2+) and an N-methylphenothiazine donor we demonstrate that a ground-state association exists between the RuL32+ and the phenothiazine prior to photoexcitation. It is this association process that is responsible for the efficient CSS formation in the bimolecular system and, by inference, also must be an essential factor in the fully intramolecular process occurring with the D-C2+-A2+ triad analogs. Alkyl-substituted bipyridine ligands in cobalt II/III complexes were modified in order to serve as efficient electron-transfer mediators in dye-sensitized solar cells. Attempts at halogen substitution reactions are described. Ultimately isopropyl groups appended to bipyridine ligands were modified by introducing a hydroxyl group at the benzylic position. The electrochemical behavior of the modified ligand is described, as well as its performance as part of a cobalt complex electron-transfer mediator in dye-sensitized solar cells.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.identifierWeber_colostate_0053A_11068.pdf
dc.identifierETDF2012500116CHEM
dc.identifier.urihttp://hdl.handle.net/10217/67322
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.titleI. Ground-state association between phenothiazine and tris(diimine)ruthenium(II) complexes: its role in highly efficient photoinduced charge separation. II. Ligand modifications of cobalt complexes to increase efficiency of electron-transfer mediators in dye-sensitized solar cells
dc.title.alternativeGround-state association between phenothiazine and tris(diimine)ruthenium(II) complexes: its role in highly efficient photoinduced charge separation
dc.title.alternativeLigand modifications of cobalt complexes to increase efficiency of electron-transfer mediators in dye-sensitized solar cells
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineChemistry
thesis.degree.grantorColorado State University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy (Ph.D.)

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