Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Zhang, Dongmao

Committee Member

Wipf, David O.

Committee Member

Mlsna, Todd E.

Date of Degree

1-1-2018

Document Type

Graduate Thesis - Open Access

Degree Name

Master of Science

College

College of Arts and Sciences

Department

Department of Chemistry

Abstract

With their unique photochemical properties, porphyrins have remained a central research topic for decades. Porphyrins can self-assemble into tubular structures at acidic pHs. However, the possibility of the disassembly of the aggregated porphyrin has not been investigated. Furthermore, quantitative understanding of the porphyrin optical activities is complicated by the complex interplay of the photon absorption, scattering, and fluorescence emission that can concurrently occur in porphyrin samples. Using meso- Tetrakis (4-sulfonato phenyl) porphyrin (TPPS) as the model molecule, discussed herein is combined UV-vis extinction, Stokes-shifted fluorescence, and polarized resonance synchronous spectroscopy (PRS2) study of porphyrin assembly and disassembly at acidic solutions. A series of optical constants, including photon absorption, scattering, and fluorescence emission cross-sections as well as its fluorescence and light scattering depolarizations has been quantified. Compared to UV-vis and SSF methods, the PRS2 is significantly more sensitivity in the detection of both concentration- and time-dependent porphyrin aggregation.

URI

https://hdl.handle.net/11668/21168

Comments

porphyrins||scattering||fluorescence emission||depolarization

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