• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
https://doi.org/10.11606/D.59.2000.tde-03042024-101813
Document
Author
Full name
Daniela Gonçalves de Abreu Favacho
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2000
Supervisor
Committee
Iamamoto, Yassuko (President)
Assis, Marilda das Dores de
Ferreira, Ana Maria da Costa
Title in Portuguese
Síntese, caracterização e propriedades catalíticas de ferroporfirinas pentafluorofenil e pentafluorofenil sulfonada
Keywords in Portuguese
Propriedades catalíticas
Química
Abstract in Portuguese
As ferroporfirinas pentafluorofenil-substituídas apresentam interessantes propriedades catalíticas. Em particular, a H2(TF15PP) e H2(TF10PP) são precursores na obtenção de catalisadores aniônicos. Realizou-se neste trabalho, a otimização de síntese da porfirina assimétrica H2(TF15PP), variando quantidades de reagentes (pirrol, pentafluorobenzaldeído e benzaldeído) e condições de reação (temperatura e oxidante). Os rendimentos totais das sínteses realizadas foram calculados de forma inédita no grupo, através de Ressonância Magnética Nuclear. Foi realizada uma extensa caracterização de todas as porfirinas base livre e ferroporfirinas (dímeros e monômeros) obtidas, por diversas técnicas como espectroscopia de UV-Vis e IV, RMN 1H e 19F e voltametria cíclica. A inserção de um grupo -SO3- na posição meta do único grupo fenil da [Fe(TF15PP)]Cl possibilitou-nos obter um catalisador pentafluorofenil-substituído aniônico. Realizou-se um estudo sistemático sobre o efeito do número de grupos pentafluorofenil na atividade catalítica das FeP. Para isso, foram feitas reações de oxidação, usando como substratos: cicloexano e (Z)-cicloocteno e como catalisador a [Fe(TF5PP)], [Fe(TF15PP)]Cl e [Fe(TF15PPSO3Na)]Cl, em suas formas monoméricas e diméricas. Além disso, o mecanismo paralelo com participação de oxigênio foi observado para [Fe(TF15PP)]Cl, mas não para [Fe(TF5PP)]Cl e [Fe(TF15PPSO3Na)]Cl. Ainda, conseguimos caracterizar os intermediários catalíticos envolvidos nas reações de oxidação, quando utilizamos a [Fe(TF5PP)2O por RPE. O estudo catalítico aliado aos dados de RPE e voltametria cíclica foi fundamental para compreender o mecanismo paralelo com a participação de O2.
Title in English
Synthesis, characterization and catalytic properties of pentafluorophenyl and sulfonated pentafluorophenyl ferroporphyrins
Keywords in English
Catalytic properties
Chemistry
Abstract in English
The pentafluorophenyl substituted FeP present interesting catalytic properties. ln particular, the H2(TF15PP) and the H2(TF10PP) are precursors to obtention of anionic catalysts. ln this work, the synthesis optimisation of the H2(TF15PP) assymmetric porphyrin, was made varying amounts of reactants (pyrrole, pentafluorbenzaldehyde, benzaldehyde) and reaction conditions as temperature and oxidant. The total yields of the syntheses were calculated in an unpublished way in the group, through Nuclear Magnetic Ressonance. An extensive characterisation of the free-base porphyrins and the corresponding FeP was carried out through several techniques as spectroscopy of UV-Vis and IR, NMR 1H and 19F and also cyclic voltametry. A group -SO3- was put in the single phenyl group of the FeTF15PP and we could to get a pentafluorophenyl substituted anionic catalyst. The systematic study on the effect of the number of groups pentafluorophenyl in the catalytic activity of the FeP was carried out. ln this way, it were made oxidation reactions, using as substrate: cyclohexane and (Z)-cyclooctene and as catalyst: [Fe(TF5PP)]Cl, [Fe(TF15PP)]Cl and [Fe(TF15PPSO3Na)]Cl, in its monomeric and dimereric. Besides, the parallel mechanism with participation of oxygen was observed for FeTF15PP, but not for FeTF5PP and [Fe(TF15PPSO3Na)]Cl. We characterise the catalytic intermediates involved in oxidation reaction using the [Fe(TF5PP)] through EPR. The catalytic study together to the EPR data and cyclic voltametry was fundamental to understand the parallel mechanism with the participation of O2.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
001107042.pdf (7.97 Mbytes)
Publishing Date
2024-04-03
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.