Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with , , , , , , and Ions in Acetonitrile, Methanol, and Ethanol Solutions
The complexation reactions between 1,10-didecyl-1,10-diaza-18-crown-6 (DD18C6) and , , , , , and ions were studied conductometrically in acetonitrile, methanol, and ethanol at various temperatures. The formation constants of the resultin...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2013/318015 |
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| author | Mehdi Taghdiri Mahmood Payehghadr Reza Behjatmanesh-Ardakani Sirous Movahhedi Farzaneh Nourifard |
| author_facet | Mehdi Taghdiri Mahmood Payehghadr Reza Behjatmanesh-Ardakani Sirous Movahhedi Farzaneh Nourifard |
| author_sort | Mehdi Taghdiri |
| collection | DOAJ |
| description | The complexation reactions between 1,10-didecyl-1,10-diaza-18-crown-6 (DD18C6) and
,
,
,
,
, and
ions were studied conductometrically in acetonitrile, methanol, and ethanol at various temperatures. The formation constants of the resulting 1 : 1 complexes were calculated from the computer fitting of the molar conductance-mole ratio data at different temperatures. In the solvents studied, the stability of the resulting complexes varied in the order acetonitrile ≫ methanol > ethanol. The enthalpy and entropy changes of the complexation reactions were evaluated from the temperature dependence of formation constants. The versus plot of thermodynamic data obtained shows a linear correlation indicating the existence of enthalpy-entropy compensation in the complexation reactions. The ab initio studies calculated at B3LYP/6-31G level of theory indicate that the binding energy of complexes decreases with increasing cation size in the gas phase. The experimental data obtained in the solvents show different trends so that the stability constant of Li+ and Mg2+ complexes is lower than other alkali and alkaline earth ions, respectively due to the solvation of these small ions in solution. |
| format | Article |
| id | doaj-art-47a16b06e6a44e2381dcb2dbde6b3d61 |
| institution | OA Journals |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-47a16b06e6a44e2381dcb2dbde6b3d612025-08-20T02:37:53ZengWileyJournal of Chemistry2090-90632090-90712013-01-01201310.1155/2013/318015318015Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with , , , , , , and Ions in Acetonitrile, Methanol, and Ethanol SolutionsMehdi Taghdiri0Mahmood Payehghadr1Reza Behjatmanesh-Ardakani2Sirous Movahhedi3Farzaneh Nourifard4Department of Chemistry, Payame Noor University, Tehran 19395-3697, IranDepartment of Chemistry, Payame Noor University, Tehran 19395-3697, IranDepartment of Chemistry, Payame Noor University, Tehran 19395-3697, IranDepartment of Chemistry, Payame Noor University, Tehran 19395-3697, IranDepartment of Chemistry, Payame Noor University, Tehran 19395-3697, IranThe complexation reactions between 1,10-didecyl-1,10-diaza-18-crown-6 (DD18C6) and , , , , , and ions were studied conductometrically in acetonitrile, methanol, and ethanol at various temperatures. The formation constants of the resulting 1 : 1 complexes were calculated from the computer fitting of the molar conductance-mole ratio data at different temperatures. In the solvents studied, the stability of the resulting complexes varied in the order acetonitrile ≫ methanol > ethanol. The enthalpy and entropy changes of the complexation reactions were evaluated from the temperature dependence of formation constants. The versus plot of thermodynamic data obtained shows a linear correlation indicating the existence of enthalpy-entropy compensation in the complexation reactions. The ab initio studies calculated at B3LYP/6-31G level of theory indicate that the binding energy of complexes decreases with increasing cation size in the gas phase. The experimental data obtained in the solvents show different trends so that the stability constant of Li+ and Mg2+ complexes is lower than other alkali and alkaline earth ions, respectively due to the solvation of these small ions in solution.http://dx.doi.org/10.1155/2013/318015 |
| spellingShingle | Mehdi Taghdiri Mahmood Payehghadr Reza Behjatmanesh-Ardakani Sirous Movahhedi Farzaneh Nourifard Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with , , , , , , and Ions in Acetonitrile, Methanol, and Ethanol Solutions Journal of Chemistry |
| title | Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with , , , , , , and Ions in Acetonitrile, Methanol, and Ethanol Solutions |
| title_full | Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with , , , , , , and Ions in Acetonitrile, Methanol, and Ethanol Solutions |
| title_fullStr | Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with , , , , , , and Ions in Acetonitrile, Methanol, and Ethanol Solutions |
| title_full_unstemmed | Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with , , , , , , and Ions in Acetonitrile, Methanol, and Ethanol Solutions |
| title_short | Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with , , , , , , and Ions in Acetonitrile, Methanol, and Ethanol Solutions |
| title_sort | conductometric studies of thermodynamics of 1 10 didecyl 1 10 diaza 18 crown 6 complexes with and ions in acetonitrile methanol and ethanol solutions |
| url | http://dx.doi.org/10.1155/2013/318015 |
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