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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Electrochemical Science Group
2011
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| Online Access: | http://psasir.upm.edu.my/id/eprint/24637/ http://psasir.upm.edu.my/id/eprint/24637/1/A%20conductometric%20study%20of%20complexation%20reaction%20between%20meso.pdf |
| _version_ | 1848845090439561216 |
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| author | Ahmadzadeh, Saeid Kassim, Anuar Rezayi, Majid Abdollahi, Yadollah Rounaghi, Gholam Hossein |
| author_facet | Ahmadzadeh, Saeid Kassim, Anuar Rezayi, Majid Abdollahi, Yadollah Rounaghi, Gholam Hossein |
| author_sort | Ahmadzadeh, Saeid |
| 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 | 2025-11-15T08:41:17Z |
| format | Article |
| id | upm-24637 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T08:41:17Z |
| publishDate | 2011 |
| publisher | Electrochemical Science Group |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-246372015-10-21T06:54:45Z http://psasir.upm.edu.my/id/eprint/24637/ A conductometric study of complexation reaction between meso-octamethylcalix[4]pyrrole with titanium cation in acetonitrile-ethanol binary mixtures. Ahmadzadeh, Saeid Kassim, Anuar Rezayi, Majid Abdollahi, Yadollah Rounaghi, Gholam Hossein 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. Electrochemical Science Group 2011 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/24637/1/A%20conductometric%20study%20of%20complexation%20reaction%20between%20meso.pdf Ahmadzadeh, Saeid and Kassim, Anuar and Rezayi, Majid and Abdollahi, Yadollah and Rounaghi, Gholam Hossein (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. ISSN 1452-3981 http://www.electrochemsci.org/ English |
| spellingShingle | Ahmadzadeh, Saeid Kassim, Anuar Rezayi, Majid Abdollahi, Yadollah Rounaghi, Gholam Hossein 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/24637/ http://psasir.upm.edu.my/id/eprint/24637/ http://psasir.upm.edu.my/id/eprint/24637/1/A%20conductometric%20study%20of%20complexation%20reaction%20between%20meso.pdf |