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Master's Dissertation
DOI
10.11606/D.59.2008.tde-04062009-094514
Document
Author
Full name
Fernanda Fugisawa Del Toso
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2008
Supervisor
Committee
Serra, Osvaldo Antonio (President)
Oliveira, Herenilton Paulino
Rosa, Ieda Lucia Viana
Title in Portuguese
Estudos sobre interações da 2,3,5,6-tetra(-piridil)pirazina (tppz) com európio e efeitos na luminescência do complexo Eu(ttfa)3
Keywords in Portuguese
európio
filme LB
luminescência
Química de coordenação
tppz
Abstract in Portuguese
Neste trabalho realizamos estudos sobre interações entre o composto 2,3,5,6-tetra(-piridil)pirazina (tppz) e Eu3+ em diferentes situações. Na primeira delas fizemos um estudo detalhado sobre as interações que ocorrem, em solução, entre o complexo tris(tenoiltrifluoroacetonato)európio(III), Eu(ttfa)3, e a tppz, em que verificamos que a tppz age como um supressor de luminescência, provavelmente através de uma segunda esfera de coordenação. Foram feitos, também, experimentos para o isolamento de cristais de complexos entre tppz e Eu3+, porém em nenhum dos métodos utilizados o complexo foi isolado, pois, quando o meio reacional voltava à temperatura ambiente a tppz precipitava. Por fim, como última tentativa de se obter complexos entre tppz e Eu3+, foram obtidos filmes por meio da técnica de Langmuir-Blodgett (LB) a partir de monocamadas mistas contendo 1-octadecanol e tppz, uma vez que a tppz sozinha não possui atividade superficial. Como resultado, foram obtidos filmes com os quais, através da espectroscopia de fotoluminescência, constatamos a formação do complexo.
Title in English
Studies on the interactions of 2,3,5,6-tetra(-pyridyl)pyrazine (tppz) with europium and effects on the luminescence of the Eu(ttfa)3 complex.
Keywords in English
Coordination chemistry
europium
LB film
luminescence
tppz
Abstract in English
In this work, we have conducted studies on the interactions of 2,3,5,6-tetra(-pyridyl)pyrazine (tppz) with Eu3+ in different situations. In the first of them, we have made a detailed study on the ongoing interactions in solution between tris(thenoiltrifluoroacetonate)europium(III), Eu(ttfa)3 and tppz, where it was verified that tppz act as a luminescence suppressor, probably through a second coordination sphere. Also, we have performed experiments with the aim of isolation crystals of complexes formed by tppz and Eu3+. However, in none of the methods used the complexes were isolated, because tppz precipitated when the reaction medium returned to the room temperature. As a last attempt to obtain the complexes between tppz and Eu3+, Langmuir-Blodgett (LB) films were formed from mixed monolayers containing 1-octadecanol and tppz, since tppz alone does not show surface activity. As a result, we have obtained films in which the complex formation was confirmed by photoluminescence spectroscopy.
 
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Publishing Date
2009-07-20
 
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