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Stereochemistry of New Nitrogen-Containing Heterocyclic Compounds. XIV. Potentiometric and Thermodynamic Studies of 5-(Phenylazo)-8-hydroxyquinolines and their Metal Complexes
Khedr, A. M., El-Bindary, A. A. and Abd El-Gawad, A. M. Stereochemistry of New Nitrogen-Containing Heterocyclic Compounds. XIV. Potentiometric and Thermodynamic Studies of 5-(Phenylazo)-8-hydroxyquinolines and their Metal Complexes Chemical Papers, Vol.59, No. 5, 2005, 336-342
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Attached Files |
| Name |
Description |
MIMEType |
Size |
Downloads |
n595a336.pdf
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595a336.pdf |
application/pdf |
154.95KB |
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| Author(s) |
Khedr, A. M.
El-Bindary, A. A.
Abd El-Gawad, A. M.
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| Title |
Stereochemistry of New Nitrogen-Containing Heterocyclic Compounds. XIV. Potentiometric and Thermodynamic Studies of 5-(Phenylazo)-8-hydroxyquinolines and their Metal Complexes
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| Journal name |
Chemical Papers
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| Publication date |
2005
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| Year available |
2005
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| Volume number |
59
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| Issue number |
5
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| ISSN |
0366-6352
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| Start page |
336
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| End page |
342
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2005
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| Language |
english
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| Subject |
250000 Chemical Sciences
250300 Organic Chemistry
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| Abstract/Summary |
A series of 5-(phenylazo)-8-hydroxyquinolines (HL1—HL6) have been prepared and characterized by elemental analysis and IR spectra. Proton-ligand dissociation constants of 5-(phenylazo)-8- hydroxyquinoline derivatives and metal—ligand stability constants of their complexes with metal ions (La3+, Ce3+, Pr3+, Zr4+, Hf4+, and Th4+) have been determined potentiometrically in 0.1 M-KCl and 40 vol. % CH3OH—water mixture. The influence of substituents on the dissociation and stability constants was examined on the basis of the electron-repelling property of the substituent. The stability constants of the formed complexes increase in the order La3+, Ce3+, Pr3+, Zr4+, Hf4+, Th4+. The effect of temperature was studied and the corresponding thermodynamic parameters (ΔG, ΔH, and ΔS) were derived and discussed.
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