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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| Format: | Article |
| Language: | English English |
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Natural Sciences Publishing Cor.
2015
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| Online Access: | http://umpir.ump.edu.my/id/eprint/9144/ 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 |
| _version_ | 1848818415723085824 |
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| 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. |
| building | UMP Institutional Repository |
| collection | Online Access |
| 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 |
| first_indexed | 2025-11-15T01:37:18Z |
| format | Article |
| id | ump-9144 |
| institution | Universiti Malaysia Pahang |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T01:37:18Z |
| publishDate | 2015 |
| publisher | Natural Sciences Publishing Cor. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | ump-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 |
| 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 |
| 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_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_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_sort | stability studies of selected metal ions chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) phenol |
| topic | Q Science (General) |
| url | http://umpir.ump.edu.my/id/eprint/9144/ http://umpir.ump.edu.my/id/eprint/9144/ http://umpir.ump.edu.my/id/eprint/9144/ 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 |