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Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with Li+, Na+, K+, Cs+, NH4+, Mg2+, and Ca2+ Ions in Acetonitrile, Methanol, and Ethanol Solutions
Joint Authors
Behjatmanesh-Ardakani, Reza
Movahhedi, Sirous
Payehghadr, Mahmood
Nourifard, Farzaneh
Taghdiri, Mehdi
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-11-21
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The complexation reactions between 1,10-didecyl-1,10-diaza-18-crown-6 (DD18C6) and Li+, Na+, K+, Cs+NH4+, Mg2+, and Ca2+ 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 TΔS° versus ΔH° 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.
American Psychological Association (APA)
Taghdiri, Mehdi& Payehghadr, Mahmood& Behjatmanesh-Ardakani, Reza& Movahhedi, Sirous& Nourifard, Farzaneh. 2012. Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with Li+, Na+, K+, Cs+, NH4+, Mg2+, and Ca2+ Ions in Acetonitrile, Methanol, and Ethanol Solutions. Journal of Chemistry،Vol. 2013, no. 2013, pp.1-9.
https://search.emarefa.net/detail/BIM-463059
Modern Language Association (MLA)
Taghdiri, Mehdi…[et al.]. Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with Li+, Na+, K+, Cs+, NH4+, Mg2+, and Ca2+ Ions in Acetonitrile, Methanol, and Ethanol Solutions. Journal of Chemistry No. 2013 (2013), pp.1-9.
https://search.emarefa.net/detail/BIM-463059
American Medical Association (AMA)
Taghdiri, Mehdi& Payehghadr, Mahmood& Behjatmanesh-Ardakani, Reza& Movahhedi, Sirous& Nourifard, Farzaneh. Conductometric Studies of Thermodynamics of 1,10-Didecyl-1,10-diaza-18-crown-6 Complexes with Li+, Na+, K+, Cs+, NH4+, Mg2+, and Ca2+ Ions in Acetonitrile, Methanol, and Ethanol Solutions. Journal of Chemistry. 2012. Vol. 2013, no. 2013, pp.1-9.
https://search.emarefa.net/detail/BIM-463059
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-463059