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Doctoral Thesis
DOI
10.11606/T.59.2008.tde-15082008-112024
Document
Author
Full name
Juliana Ribeiro Steter
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2008
Supervisor
Committee
Romero, Jose Ricardo (President)
Chiericato Junior, Glaico
Madurro, João Marcos
Motheo, Artur de Jesus
Souza, Ernesto Chaves Pereira de
Title in Portuguese
Ancoragem covalente de piridina à matriz polimérica do filme poli-(fenol-azo-benzeno). Preparação de eletrodos modificados com propriedades oxidantes de substratos orgânicos
Keywords in Portuguese
complexo de rutênio
eletodos modificados
eletrooxidação catalítica.
Abstract in Portuguese
Neste trabalho os complexos cis- [Ru(BAF)(bpy)(PPh3)(OH2)](ClO4)2 (monômero B) e cis-[Ru(dmbpy)2(PPh3)(OH2)](OPh)2 (monômero C) foram sintetizados e caracterizados através de métodos espectroscópicos e eletroquímicos, sendo utilizados na construção de novos eletrodos modificados EMs e aplicados na eletrooxidação de substratos orgânicos. A preparação destes EMs consistiu no recobrimento da superfície de eletrodos de feltro de carbono e de bastões de grafite pelos filmes poliméricos ancorados ao rutênio. Os intervalos de potencial aplicados para a polimerização dos complexos foram àqueles correspondentes, respectivamente, aos potenciais de polimerização do contra-íon difenolato e do ligante azóico contendo o grupamento fenol. A atividade catalítica destes EMs foi investigada através de um estudo cinético, através de eletrooxidações heterogêneas acompanhadas por UV/Vis de diversos compostos orgânicos como: safrol, isosafrol, álcool benzílico, fenil etil álcool, etil benzeno, tolueno, benzaldeído, ciclo hexen-2-ol, demonstrando que os EMs podem ser utilizados como catalisadores em reações de eletrooxidações com rendimentos satisfatórios.
Title in English
Pyridine anchored to polymeric film poly-(phenol-azo-benzene). Preparation of modified electrodes with oxidants proprieties of organic substrates.
Keywords in English
Pyridine anchored to polymeric film poly-(phenol-azo-benzene). Preparation of modified electrodes
Abstract in English
In this work the complexes cis-[Ru(BAF)(bpy)(PPh3)(OH2)](ClO4)2 (B monomer) and cis-[Ru(dmbpy)2(PPh3)(OH2)](OPh)2 (C monomer) were synthesized and characterized by spectroscopic and electrochemical methods, and they were utilized in construction of new modified electrodes (MEs) and applied in electrooxidation of organic substrates. The preparation of these new MEs was done by coating the surfaces of carbon felt and carbon rod electrodes by polymeric films where the ruthenium complexes were anchored. The potential range applied to accomplish the polimerization of the complexes corresponds to the potencial ranges of diphenol anion and azoic ligand with the phenolic group, respectively. The catalytic activity of these MEs was studied by kinetic methodology monitoring the heterogeneous electroxidations by UV/Vis of some organic substrates like: safrol, isosafrol, benzylic alcohol, phenil ethyl alcohol, ethyl benzene, toluene, cycle-hexen-2-ol, showing that these EMs can be utilized as catalyst in electrooxidations reactions with goods yields.
 
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Publishing Date
2008-08-25
 
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