Thesis (M.F.A.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of English / Full text of this thesis is not available

The research presented in this thesis deals with the synthesis, optical and photochemical studies of various porphyrin and/or fullerene based systems. The second chapter deals with the study of fullerene based molecules composed of C60 covalently linked to ferrocene and various nitroaromatic entities. Chapter three involves the study of molecules composed of zinc porphyrin covalently linked with ferrocene(s) self-assembled into supramolecular triads by axial ligation of imidazole bearing fulleropyrrolidine. The triad studied in Chapter four is composed of zinc porphyrin covalently linked to boron-dipyrrin which was selfassembled into a supramolecular complex by axial ligation of imidazole appended fulleropyrrolidine. Chapter five deals with the formation of a dyad complex composed of Zinc N-confused porphyrin axially coordinated to imidazole bearing fulleropyrrolidine. The compounds discussed in this thesis were studied by optical absorbance and emission, electrochemical, and time-resolved photochemical methods. These compounds were mainly characterized by 1H NMR, UV-vis absorbance, and ESI-mass. Binding constants for the supramolecular complexes were arrived using UV-vis spectroscopic methods. Also, B3LYP/3-21G(*) computational method was used to probe the geometric and electronic structure of the compounds studied. The triads studied in Chapter two revealed efficient photoinduced chargeseparation. Interestingly, the computed site of electron transfer using DFT methods was found to track the electrochemical results observed in the cyclic voltammetric experiments. The self-assembled triads in Chapter three revealed efficient charge-separation from the excited zinc porphyrin to the fullerene (C60) entity. Also, the triads revealed efficient charge stabilization due to the presence of ferrocene(s). The self-assembled triad in Chapter four revealed efficient energy transfer from the boron-dipyrrin entity to zinc porphyrin. The selfassembled triad exhibited energy transfer followed by electron transfer to the fullerene (C60) entity. In Chapter five the construction of a dyad composed of zinc N-confused porphyrin and fullerene (C60) was confirmed. Spectro- and photochemical experiments revealed efficient electron transfer from the porphyrin to the fullerene entity. / Thesis (Ph.D.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Chemistry. / "May 2006." / Includes bibliographic references (leaves 147-155).

The research reported in this thesis details the synthesis, characterization, electrochemical and photochemical studies of noncovalently linked porphyrin-fullerene based donor-acceptor systems. The first chapter gives an introduction that briefly summarizes the significant events that occur in natural photosynthetic systems, the importance of artificial photosynthetic models and finally, lists new developments in model biomimetic systems of this type. The second chapter discusses synthesis of control compounds and physical methods used in later chapters. The third chapter focuses on the investigation of covalently linked porphyrin-fullerene dyads. A discussion of the role of axially ligated pyridine in decreasing charge recombination rates can also be found in this chapter. The main investigations in the fourth chapter utilize noncovalently linked porphyrin-fullerene triads with two axial coordination bonds with an emphasis on the importance of structural rigidity and the orientation of the donoracceptor entities. The fifth chapter discusses the purpose of a secondary donor and the effect it has in charge separation and charge recombination rates for self assembled supramolecular triads formed via "two-point" binding. Noncovalently linked magnesium porphyrin-fullerene dyads and triads are presented in chapter six. The compounds contained in this thesis were synthesized and characterized by proton NMR and ESI-Mass spectroscopy. Binding constants were obtained by using UV-visible, fluorescence and 1H NMR spectral data. DFT calculations were performed to gain insight into the structural aspects and orientation of the donor-acceptor groups in these supramolecular complexes. Electrochemical and emissions studies (i.e. steady state and time resolved fluorescence, transient absorption) were employed to obtain free energy changes for electron transfer, lifetimes, charge separation and charge recombination rates for photo - induced electron transfer. / Thesis (Ph.D.)--Wichita State University, College of Arts and Sciences, Dept. of Chemistry. / Includes bibliographic references (leaves 189-199). / "May 2006."

The design of a stochastic optimal controller using state feedback and output feedback is developed for unified, decentralized, singularly perturbed systems with Gaussian noise. To filter out the external noises contained in the system signals, a unified optimal observer (Kalman filter) is used for the decentralized, singularly perturbed system with a reduced-order model. The reduced-order stabilizing observer is also derived by the unified Riccati equation approach. Rationalization of the decentralized, singularly perturbed system with time delays is presented in the frequency domain by using the delta operator approach. It is shown that the discrete-time system is realized into the discrete-time state-space model. The stability robustness of a unified decentralized singularly perturbed stochastic system is investigated by exploring stability bounds under system uncertainties. A new unified stochastic bound is derived for both "unstructured" and "structured" time-varying independent perturbations. / Thesis (Ph.D.)--Wichita State University, College of Engineering. / Includes bibliographic references (leaves 128-132). / "May 2006." / Includes bibliographic references (leaves 128-132)

Thesis (M. P. A.)--Texas State University-San Marcos, 2009. / "Fall 2009." Includes bibliographical references (leaves 83-92).

Thesis (M.A.)--University of North Carolina Wilmington, 2009. / Title from PDF title page (February 17, 2010) Includes bibliographical references (p. 190-198)

Thesis (M.A.)--University of North Carolina at Wilmington, 2004. / Includes bibliographical references (leaves : [58]-61).

Thesis (M.S.)--University of North Carolina at Wilmington, 2004. / Includes bibliographical references (leaves : [49]-52).

Thesis (M.A.)--University of North Carolina at Wilmington, 2004. / Includes bibliographical references (leaves : [38]-40).

Thesis (M.S.)--University of North Carolina at Wilmington, 2003. / Includes bibliographical references (leaves : [44]-49).