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Potentiometric and Thermodynamic Studies of 4-Sulfamethoxazoleazo-3-methyl-2-pyrazolin-5-one and its Metal Complexes
Al-Sarawy, A. A. Potentiometric and Thermodynamic Studies of 4-Sulfamethoxazoleazo-3-methyl-2-pyrazolin-5-one and its Metal Complexes Chemical Papers, Vol.58, No. 2, 2004, 109-112
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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 |
n582a109.pdf
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582a109.pdf |
application/pdf |
131.96KB |
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| Author(s) |
Al-Sarawy, A. A.
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| Title |
Potentiometric and Thermodynamic Studies of 4-Sulfamethoxazoleazo-3-methyl-2-pyrazolin-5-one and its Metal Complexes
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| Journal name |
Chemical Papers
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| Publication date |
2004
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| Year available |
2004
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| Volume number |
58
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| Issue number |
2
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| ISSN |
0366-6352
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| Start page |
109
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| End page |
112
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2004
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| Language |
english
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| Subject |
250000 Chemical Sciences
250100 Physical Chemistry (incl. Structural)
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| Abstract/Summary |
The dissociation constant of 4-sulfamethoxazoleazo-3-methyl-2-pyrazolin-5-one and metal—ligand stability constants of its complexes with bivalent (Mn2+, Co2+, Ni2+, and Cu2+) metal ions have been determined potentiometrically in 0.1 M-KCl and 40 vol. % ethanol—water mixture. The order of the stability constants of the formed complexes decreases in the sequence Cu2+, Ni2+, Co2+, Mn2+. The effect of temperature was studied and the corresponding thermodynamic parameters (ΔG, ΔH, and ΔS) were derived and discussed. The dissociation process is nonspontaneous, endothermic and entropically unfavourable. The formation of the metal complexes has been found to be spontaneous, endothermic, and entropically favourable.
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