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Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol

Acid dissociation and complex stability constants of 2-(4-Amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3- ylideneamino) phenol (H2A) with some metal ions chelates have been determined potentiometrically using 0.1 M KCl and 20 % (v/v) ethanol-water mixture. The stability constants of the formed c...

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Main Authors: Gouda, Gamal A., Ali, Gomaa A. M., Elnasr, Tarek A. Seaf
格式: Article
語言:English
English
出版: Natural Sciences Publishing Cor. 2015
主題:
Q Science (General)
在線閱讀:http://umpir.ump.edu.my/id/eprint/9144/1/Stability%20Studies%20of%20Selected%20Metal%20Ions%20Chelates%20with%202-%284-amino-1%2C5-%20dimethyl-2-phenyl-1%2C2-dihydro-pyrazol-3-ylideneamino%29%20Phenol.pdf
http://umpir.ump.edu.my/id/eprint/9144/7/fist-2015-gomaa-Stability%20Studies%20of%20Selected%20Metal%20Ions%20Chelates.pdf
http://umpir.ump.edu.my/id/eprint/9144/
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spelling my.ump.umpir.91442016-08-25T04:09:27Z http://umpir.ump.edu.my/id/eprint/9144/ Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol Gouda, Gamal A. Ali, Gomaa A. M. Elnasr, Tarek A. Seaf Q Science (General) Acid dissociation and complex stability constants of 2-(4-Amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3- ylideneamino) phenol (H2A) with some metal ions chelates have been determined potentiometrically using 0.1 M KCl and 20 % (v/v) ethanol-water mixture. The stability constants of the formed complexes were found to be in the order Re5+ > Ce3+ > Pd2+ >Th4+ > Hg2+ > Co2+. The dissociation constants (pKa) of H2A and the stability constants (log Ki) of their complexes were determined at 298, 308 and 318 K. The corresponding thermodynamic parameters (ΔG, ΔH and ΔS) were calculated and discussed. The results indicated that, the dissociation process is non-spontaneous, endothermic and entropically unfavorable. The formation of the metal complexes has been found to be endothermic and entropically favorable Natural Sciences Publishing Cor. 2015 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/9144/1/Stability%20Studies%20of%20Selected%20Metal%20Ions%20Chelates%20with%202-%284-amino-1%2C5-%20dimethyl-2-phenyl-1%2C2-dihydro-pyrazol-3-ylideneamino%29%20Phenol.pdf application/pdf en http://umpir.ump.edu.my/id/eprint/9144/7/fist-2015-gomaa-Stability%20Studies%20of%20Selected%20Metal%20Ions%20Chelates.pdf Gouda, Gamal A. and Ali, Gomaa A. M. and Elnasr, Tarek A. Seaf (2015) Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol. International Journal of Nanomaterials and Chemistry, 1 (2). pp. 39-44. ISSN 2090-9578 (Print); 2090-9586 (Online). (Published) http://www.naturalspublishing.com/files/published/3916x9tx4dmv67.pdf DOI: 10.12785/ijnc/010201r
institution Universiti Malaysia Pahang Al-Sultan Abdullah
building UMPSA Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang Al-Sultan Abdullah
content_source UMPSA Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
English
topic Q Science (General)
spellingShingle Q Science (General)
Gouda, Gamal A.
Ali, Gomaa A. M.
Elnasr, Tarek A. Seaf
Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol
description Acid dissociation and complex stability constants of 2-(4-Amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3- ylideneamino) phenol (H2A) with some metal ions chelates have been determined potentiometrically using 0.1 M KCl and 20 % (v/v) ethanol-water mixture. The stability constants of the formed complexes were found to be in the order Re5+ > Ce3+ > Pd2+ >Th4+ > Hg2+ > Co2+. The dissociation constants (pKa) of H2A and the stability constants (log Ki) of their complexes were determined at 298, 308 and 318 K. The corresponding thermodynamic parameters (ΔG, ΔH and ΔS) were calculated and discussed. The results indicated that, the dissociation process is non-spontaneous, endothermic and entropically unfavorable. The formation of the metal complexes has been found to be endothermic and entropically favorable
format Article
author Gouda, Gamal A.
Ali, Gomaa A. M.
Elnasr, Tarek A. Seaf
author_facet Gouda, Gamal A.
Ali, Gomaa A. M.
Elnasr, Tarek A. Seaf
author_sort Gouda, Gamal A.
title Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol
title_short Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol
title_full Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol
title_fullStr Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol
title_full_unstemmed Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol
title_sort stability studies of selected metal ions chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) phenol
publisher Natural Sciences Publishing Cor.
publishDate 2015
url http://umpir.ump.edu.my/id/eprint/9144/1/Stability%20Studies%20of%20Selected%20Metal%20Ions%20Chelates%20with%202-%284-amino-1%2C5-%20dimethyl-2-phenyl-1%2C2-dihydro-pyrazol-3-ylideneamino%29%20Phenol.pdf
http://umpir.ump.edu.my/id/eprint/9144/7/fist-2015-gomaa-Stability%20Studies%20of%20Selected%20Metal%20Ions%20Chelates.pdf
http://umpir.ump.edu.my/id/eprint/9144/
http://www.naturalspublishing.com/files/published/3916x9tx4dmv67.pdf
_version_ 1822916848060989440
score 13.251813

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