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Full-Text Articles in Physical Sciences and Mathematics
Parsing The Aggregation- And Photodegradation-Induced Effects Of Rhodamine-Sensitized Tio2 And Zro2 Films, James Cassidy
Parsing The Aggregation- And Photodegradation-Induced Effects Of Rhodamine-Sensitized Tio2 And Zro2 Films, James Cassidy
Dissertations, Theses, and Masters Projects
The impact of rhodamine aggregates on the photophysical properties of rhodamine dyes adsorbed to TiO2 were investigated using diffuse reflectance spectroscopy, steady-state fluorescence, and time-correlated single photon counting (TCSPC). Photocatalyzed de-alkylation of rhodamine dyes containing tertiary amine groups (5-ROX, R101, and RB) was observed on TiO2, which resulted in a ~50 nm hypsochromic shift. Therefore, concentration dependent diffuse reflectance spectra of R560/TiO2 samples, which contained primary amines, demonstrated the formation of H- and J-aggregates at the expense of the monomers. The formation of J-aggregates resulted in FRET between monomers and J-aggregates which yielded a bathochromic shifted fluorescence spectra as a …
Investigating The Charge-Transfer Dynamics Of Single-Molecule Sensitizers, Jenna Tan
Investigating The Charge-Transfer Dynamics Of Single-Molecule Sensitizers, Jenna Tan
Dissertations, Theses, and Masters Projects
Dye-sensitized solar cells (DSSCs) can reduce the cost of photovoltaic electricity generation to meet global energy needs. Optimizing DSSC efficiency requires a detailed understanding of the underlying charge transfer processes at the dye-semiconductor interface. By modifying the sensitizer structure, we gain insight into these charge transfer mechanisms. In this thesis, two hydroxyanthraquinone dyes are compared to investigate the impact of structure on charge-transfer and photobleaching dynamics. A combination of ensemble-averaged and single-molecule spectroscopy approaches are used to interpret the underlying ET kinetics.
Synthesis Of [2.2.2]-Diazabicyclic Alkaloids: I: Diels-Alder Reactions Of A C2-Carboxy Pyrazinone & Ii: Intermolecular Diels-Alder Reaction Of A Proline Derived Pyrazinone With Symmetric Dienophiles, Jonathan Clarence Perkins
Synthesis Of [2.2.2]-Diazabicyclic Alkaloids: I: Diels-Alder Reactions Of A C2-Carboxy Pyrazinone & Ii: Intermolecular Diels-Alder Reaction Of A Proline Derived Pyrazinone With Symmetric Dienophiles, Jonathan Clarence Perkins
Dissertations, Theses, and Masters Projects
[2.2.2]-Diazabicyclic alkaloids are a natural product family with diverse biological activities. The development of a synthetic methods towards the synthesis of [2.2.2]-diazabicyclic alkaloids is described. I: Diels-Alder Reactions of a C2-Carboxy Pyrazinone Using an N-heterocyclic carbene catalyzed aroylation of a proline 3,5-dichloropyrazinone, a synthetic route to C2-carboxy pyrazinones was developed to study the intermolecular and intramolecular Diels-Alder reactions of these compounds to form the bicyclo[2.2.2]diazaoctane core. Studies showed that having oxidation present α to the pyrazinone ring did not provide any significant increase in reactivity or selectivity as compared to pyrazinones without oxidation α to the ring. In some cases, …