Spectroscopy study of 5-amino-1,10-phenanthroline
Acidity constants for the 5-amino-1,10-phenanthroline (5-Aphen) were determined in aqueous media, using SQUAD and SUPERQUAD programs. Spectrophotometry and potentiometry data were fitted to the best model to enable correlation of the following acidity equilibria: 5-AphenH=5-Aphen+H + (− log K=5.78±0...
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| Published in | Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 60; no. 4; pp. 781 - 789 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
England
Elsevier B.V
01.03.2004
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| Abstract | Acidity constants for the 5-amino-1,10-phenanthroline (5-Aphen) were determined in aqueous media, using SQUAD and SUPERQUAD programs. Spectrophotometry and potentiometry data were fitted to the best model to enable correlation of the following acidity equilibria: 5-AphenH=5-Aphen+H
+ (−
log
K=5.78±0.03
) and 5-AphenH
2=5-Aphen+2H
+ (−
log
K=6.89±0.07
). UV absorptivity coefficients obtained suggest that the first protonation takes place on the nitrogens of the heterocycle ring and the second protonation could take place on the amino group. As expected, the electrochemical evidence of the 5-Aphen species depends on the degree of protonation. |
|---|---|
| AbstractList | Acidity constants for the 5-amino-1,10-phenanthroline (5-Aphen) were determined in aqueous media, using SQUAD and SUPERQUAD programs. Spectrophotometry and potentiometry data were fitted to the best model to enable correlation of the following acidity equilibria: 5-AphenH=5-Aphen+H
+ (−
log
K=5.78±0.03
) and 5-AphenH
2=5-Aphen+2H
+ (−
log
K=6.89±0.07
). UV absorptivity coefficients obtained suggest that the first protonation takes place on the nitrogens of the heterocycle ring and the second protonation could take place on the amino group. As expected, the electrochemical evidence of the 5-Aphen species depends on the degree of protonation. Acidity constants for the 5-amino-1,10-phenanthroline (5-Aphen) were determined in aqueous media, using SQUAD and SUPERQUAD programs. Spectrophotometry and potentiometry data were fitted to the best model to enable correlation of the following acidity equilibria: 5-AphenH = 5-Aphen + H+ (-log K = 5.78 +/= 0.03) and 5-AphenH2 = 5-AphenH2 = 5-Aphen + 2H+ (-log K = 6.89 +/= 0.07). UV absorptivity coefficients obtained suggest that the first protonation takes place on the nitrogens of the heterocycle ring and the second protonation could take place on the amino group. As expected, the electrochemical evidence of the 5-Aphen species depends on the degree of protonation. |
| Author | Pacheco-Hernández, Ma de Lourdes Gómez-Hernández, Martı́n Rojas-Hernández, Alberto Galicia, Laura Ramı́rez-Silva, Ma.Teresa |
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| Keywords | 5 Amino-1,10 phenanthroline Spectroscopic study Acidity constants |
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| Snippet | Acidity constants for the 5-amino-1,10-phenanthroline (5-Aphen) were determined in aqueous media, using SQUAD and SUPERQUAD programs. Spectrophotometry and... |
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| SubjectTerms | 5 Amino-1,10 phenanthroline Acidity constants Electrochemistry Hydrogen-Ion Concentration Models, Chemical Nitrogen - chemistry Phenanthrolines - analysis Potentiometry Protons Software Spectrophotometry - methods Spectroscopic study Ultraviolet Rays |
| Title | Spectroscopy study of 5-amino-1,10-phenanthroline |
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