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Banca de DEFESA: ROBERTA ALBINO DOS REIS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ROBERTA ALBINO DOS REIS
DATA : 17/05/2023
HORA: 10:00
LOCAL: meet.google.com/bvh-iedk-uzp
TÍTULO:

PHYSICAL ORGANIC CHEMISTRY APPLIED FOR THE DEVELOPMENT OF NANOTECHNOLOGY AND CHEMILUMINESCENCE: AN INTERDISCIPLINARY APPROACH


PÁGINAS: 154
RESUMO:

In the present work, an interdisciplinary view of physical organic chemistry is explored. This entails identifying intermediates and unveiling transition states in the reaction pathway, as well as determining the kinetics involved along the processes of physicochemical phenomena. Studies I and II aimed to rationalize the mechanism involved in two different chemiluminescent (CL) systems, together with the photophysical characterization of their constituents. Study I was the investigation of a peroxyoxalate system in alcoholic solvents (methanol, ethanol, and isopropanol) without basic/nucleophilic catalysis. We have found that the peroxyoxalate system’s high-energy intermediate is efficiently generated in the absence of basic/nucleophilic catalysis in these polar protic media. Also, chemiexcitation yields showed to increase with viscosity, although other solvent properties may contribute with this process. In Study II, we presented the synthesis and characterization of ortho, meta, and para silyloxy-protected 1,2-dioxetanes derived from a tetraphenylimidazole framework, whose fluoride-induced decomposition occurs with CL. An intramolecular electron transfer from an N-sp2 donor of the imidazolyl group to the O–O peroxidic system was suggested to occur during 1,2-dioxetane decomposition, influenced by the phenolate group position. It seems that additional resonance structures that enable the access to singlet excited states are present with the phenoxy group in meta, although not with ortho and para orientations. Nevertheless, the decomposition of the ortho/para substituted 1,2-dioxetanes may occur easily to the production of ground state species. In Study III, we present an investigation conducted at the University of Bradford, UK, using MOFs as a vehicle for an herbicide. In this study, two zirconium-based MOFs, UiO-66 and UiO-66-NH2 were employed for the loading and release of 2,4-dichlorophenoxyacetic acid (2,4-D). The MOFs were loaded via two loading methods, in-situ, and post-synthetic. The MOFs and their composites showed sustained release over a period of 16 days, with high loading capacity and UiO-66 having a faster rate of release than UiO-66-NH2. The use of MOFs as nanocarriers for controlled release shows promise in drug delivery and combating pesticide contamination. As a general conclusion, we can state that the main objectives of this thesis were achieved, towards a higher interdisciplinary understanding of certain physicochemical processes, while also proposing some perspectives and possibilities for future research.


MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1939561 - FERNANDO HEERING BARTOLONI
Membro Titular - Examinador(a) Externo ao Programa - 1548095 - PATRICIA DANTONI
Membro Titular - Examinador(a) Externo à Instituição - CAMILA NEVES LANGE
Membro Titular - Examinador(a) Externo à Instituição - MAIDILEYVIS CASTRO CABELLO
Membro Titular - Examinador(a) Externo à Instituição - ANA CLARA BELTRAN RODRIGUES - UC
Membro Suplente - Examinador(a) Interno ao Programa - 1909951 - ARTUR FRANZ KEPPLER
Membro Suplente - Examinador(a) Externo à Instituição - Juliana de Carvalho Izidoro
Membro Suplente - Examinador(a) Externo à Instituição - ROGER BORGES - Einsten
Notícia cadastrada em: 02/05/2023 14:16
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