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Master's Dissertation
DOI
10.11606/D.46.2007.tde-30112007-104916
Document
Author
Full name
Rebeca Evahides Yatsuzuka
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Araki, Koiti (President)
Corio, Paola
Demets, Grégoire Jean Francois
Title in Portuguese
Nanomateriais híbridos de porfirinas supramoleculares e nanoparticulas de ouro e suas aplicações em dispositivos amperométricos
Keywords in Portuguese
Carboxilato de ródio
Eletrocatálise
Nanopartículas de ouro
Nanotecnologia
Porfirina
Química supramolecular
Abstract in Portuguese
Sistemas supermoleculares constituídos por compostos porfirínicos apresentam propriedades e aplicações interessantes na área de catálise, sensores molecular, fotoeletroquímica, dentre diversas outras aplicações. Catalisadores mais eficientes e seletivos para a oxidação de substratos orgânicos são de grande interesse tecnológico. Sistemas supramoleculares contendo metaloporfirinas podem ser ainda utilizados como materiais ativos de sensores para diversas substâncias químicas de grande interesse comercial e ambiental. Nanopartículas de ouro podem ser versáteis "blocos de construção" para obtenção de nanomateriais híbridos devido à possibilidade da funcionalização de sua superfície com diversos ligantes com propriedades específicas. Neste trabalho, uma nova série de porfirinas obtidas por montagem coordenativa de quatro complexos dinucleares de carboxilato de ródio (3TPyP-Rh) foi preparada e caracterizada por espectroscopia UV-vis, ressonância magnética nuclear, termogravimetria e voltametria cíclica. Filmes supramoleculares híbridos obtidos a partir de nanopartículas de ouro reativas e porfirinas (metaloporfirinas e a supermolécula, 3TPyP-Rh) foram preparadas sobre eletrodos de FTO. Esses eletrodos modificados tiveram suas propriedades eletrocatalíticas estudadas, tendo-se em vista a obtenção de novos sensores amperométricos e comprovar a possibilidade de se modificar as propriedades desse tipo de nanomateriais variando-se os ligantes pontes moleculares.
Title in English
Hybrid nanomateriais of supramolecular porphyrins and gold nanoparticles and its applications in amperometrics devices
Keywords in English
Carboxilato dirhodium
Eletrocatalysis
Nanotechnology
Porphirin
Supramolecular chemistry
Abstract in English
Supramolecular systems consisting by porphyrin derivatives present interesting properties and applications in catalysis, molecular sensors, photoelectrochemistry, among many other applications. Supramolecular systems constituted by metalloporphyrins can be explored as active materials of sensors for several chemical substances of commercial and environmental interest. Gold nanoparticles can be versatile "building blocks" for the preparation of hybrid nanomateriais due to possibility of functionalization with diverse ligands with specific properties. In this work, a new series of porphyrins was obtained by coordenative assembly of four acetate complexes of dirhodium (3TPyP-Rh) and characterized by eletronic spectroscopy, nuclear magnetic resonance, termogravimetric analysis and cyclic voltammetry. FTO electrodes were modified with films of hybrid supramolecular nanomaterials build-up from reactive gold nanoparticles and meso-tetrayridylporphyrin derivatives (metaloporphyrins and the supermolecule, 3TPyP-RH). The eletrocatalytic properties were studied aiming the preparation of new amperometrics sensor and to demonstrate the possibility of controlling the properties of this type of nanomaterials by varying the molecular multi-bridge ligands. We found out that the AuNP/metalloporphyrin nanomaterials films are electrochemically and electrocatalytic active for the oxidation of substrates of great commercial interest, as ascorbic acid, sulfite and peroxide of hydrogen.
 
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Publishing Date
2007-12-05
 
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