A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures
The equilibrium constants and thermodynamic parameters for complexation process between titanium (III) cation and meso-octamethylcalix[4]pyrrole were determined by conductivity measurements in acetonitrile–ethanol (AN–EtOH) binary mixture at different temperatures. The conductance data show that the...
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| Format: | Article |
| Language: | English English |
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2011
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| Online Access: | http://psasir.upm.edu.my/id/eprint/18781/ http://psasir.upm.edu.my/id/eprint/18781/1/A%20Conductometric%20Study%20of%20Complexation%20Reaction%20Between%20Meso.pdf |
| _version_ | 1848843590421184512 |
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| author | Kassim, Anuar Ahmadzadeh, Saeid Rezayi, Majid Rounaghi, Gholam Hossein Abdollahi, Yadollah |
| author_facet | Kassim, Anuar Ahmadzadeh, Saeid Rezayi, Majid Rounaghi, Gholam Hossein Abdollahi, Yadollah |
| author_sort | Kassim, Anuar |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The equilibrium constants and thermodynamic parameters for complexation process between titanium (III) cation and meso-octamethylcalix[4]pyrrole were determined by conductivity measurements in acetonitrile–ethanol (AN–EtOH) binary mixture at different temperatures. The conductance data show that the stoichiometry of the (meso-octamethylcalix[4]pyrrole.[Ti(OH)-(H2O)5])2+ complex in all binary mixed solvents is 1:1[I:M]. The stability of the formed complex is sensitive to the solvent composition and a non-linear behavior was observed for changes of log Kf of this complex versus the composition of the binary mixed solvents. The values of thermodynamic parameters (Hc and Sc) for formation of (meso-octamethylcalix[4]pyrrole.[Ti(OH)-(H2O)5])2+ complex were obtained from temperature dependence of the stability constant using van’t Hoff plots. The obtained results show that the formed complex is enthalpy destabilized, but entropy stabilized and a non-monotonic behavior was observed for variations of standard enthalpy and entropy changes versus the composition of the binary mixed solvents. |
| first_indexed | 2025-11-15T08:17:27Z |
| format | Article |
| id | upm-18781 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T08:17:27Z |
| publishDate | 2011 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-187812015-09-22T00:07:15Z http://psasir.upm.edu.my/id/eprint/18781/ A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures Kassim, Anuar Ahmadzadeh, Saeid Rezayi, Majid Rounaghi, Gholam Hossein Abdollahi, Yadollah The equilibrium constants and thermodynamic parameters for complexation process between titanium (III) cation and meso-octamethylcalix[4]pyrrole were determined by conductivity measurements in acetonitrile–ethanol (AN–EtOH) binary mixture at different temperatures. The conductance data show that the stoichiometry of the (meso-octamethylcalix[4]pyrrole.[Ti(OH)-(H2O)5])2+ complex in all binary mixed solvents is 1:1[I:M]. The stability of the formed complex is sensitive to the solvent composition and a non-linear behavior was observed for changes of log Kf of this complex versus the composition of the binary mixed solvents. The values of thermodynamic parameters (Hc and Sc) for formation of (meso-octamethylcalix[4]pyrrole.[Ti(OH)-(H2O)5])2+ complex were obtained from temperature dependence of the stability constant using van’t Hoff plots. The obtained results show that the formed complex is enthalpy destabilized, but entropy stabilized and a non-monotonic behavior was observed for variations of standard enthalpy and entropy changes versus the composition of the binary mixed solvents. 2011 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/18781/1/A%20Conductometric%20Study%20of%20Complexation%20Reaction%20Between%20Meso.pdf Kassim, Anuar and Ahmadzadeh, Saeid and Rezayi, Majid and Rounaghi, Gholam Hossein and Abdollahi, Yadollah (2011) A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures. International Journal of Electrochemical Science, 6. pp. 4749-4759. http://www.electrochemsci.org/papers/vol6/6104749.pdf English |
| spellingShingle | Kassim, Anuar Ahmadzadeh, Saeid Rezayi, Majid Rounaghi, Gholam Hossein Abdollahi, Yadollah A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures |
| title | A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures |
| title_full | A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures |
| title_fullStr | A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures |
| title_full_unstemmed | A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures |
| title_short | A Conductometric Study of Complexation Reaction Between Meso-octamethylcalix [4] pyrrole with Titanium Cation in Acetonitrile–Ethanol Binary Mixtures |
| title_sort | conductometric study of complexation reaction between meso-octamethylcalix [4] pyrrole with titanium cation in acetonitrile–ethanol binary mixtures |
| url | http://psasir.upm.edu.my/id/eprint/18781/ http://psasir.upm.edu.my/id/eprint/18781/ http://psasir.upm.edu.my/id/eprint/18781/1/A%20Conductometric%20Study%20of%20Complexation%20Reaction%20Between%20Meso.pdf |