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Master's Dissertation
DOI
10.11606/D.46.1986.tde-16052008-092501
Document
Author
Full name
Mauro Bertotti
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1986
Supervisor
Committee
Tokoro, Roberto (President)
Melios, Cristo Bladimiros
Oliveira Neto, Graciliano de
Title in Portuguese
Estudos potenciométricos sobre a formção de complexos entre índio (III) e azoteto, em meio aquoso
Keywords in Portuguese
Azoteto
Índio
Potenciometria
Abstract in Portuguese
O presente estudo procura dar continuidade a um dos ramos de pesquisa desenvolvidos na área de Analítica do Instituto de Química da USP, onde se procura estudar a química de complexos formados entre diferentes metais e o ânion azoteto, N-3. O cátion índio(III), à semelhança do que ocorre com o ferro (III), complexa com o ânion azoteto em meio aquoso. Este poder de complexação foi constatado em estudos polarográficos do sistema In N3+ / N-3 ora em desenvolvimento. A obtenção das constantes de estabilidade dos complexos formados entre o In3+ e o ligante azoteto, por via potenciométrica, baseia-se na alteração do pH do tampão formado por N-3 e o ácido fraco HN3, quando se adicionam íons In3+. O acompanhamento da variação da concentração hidrogeniônica foi f.eito com o auxílio do eletrodo de vidro combinado. A concentração de N-3 de equilíbrio variou de valores próximos de zero a 90 mM, para que se obtivessem dados na mais larga faixa de concentraç6es de ligante. Manteve-se a força iônica das soluções em 2,00OM (NaCI04) e trabalhou-se a 25,0οC. A análise dos dados experimentais e tratamento matemático dos mesmos, evidenciaram a formação de complexos mononucleares e os valores das constantes globais encontrados foram: β1 = (2,0 ± 0,1) x 103M-1 β2 = (7 ± 3) x 105M-2 β3 = (5 ± 1) x 107M-3 β4 = (7 ± 3) x 108M-4
Title in English
Potentiometric studies on the formation of indium (III) azide complexes in aqueous medium
Keywords in English
Azide
Indium (III)
Potentiometry
Abstract in English
The present study is a branch of the main work concerned with the complex formation between several metal cations and azide anion in aqueous media. Indium (III) was selected, in analogy to iron (III), because forms complexes with azide in aqueous media. Polarographic studies in development showed the tendency of these complexation. To determine the stability constants of complexes was used potentiometric method using glass e1ectrode. The main advantage is based on pH modification of the buffer solution constituted by azide and hidrazoic acid (N-3;/HN3) when indium (III) cations are added in the buffer. The azide concentration was a1tered from near zero to 90 mM, the ionic strenght he1d at 2,000 M with sodium perchlorate and the temperature kept constant at 25,0°C. The evaluation of experimental data shawed mononuclear species and the global constants found were: β1 = (2,0 ± 0,1) x 103M-1 β2 = (7 ± 3) x 105M-2 β3 = (5 ± 1) x 107M-3 β4 = (7 ± 3) x 108M-4
 
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Publishing Date
2008-05-19
 
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