A thermodynamic study on the complex formation between tris(2-pyridyl)methylamine (tpm) with fe2+, fe3+, cu2+ and cr3+ cations in water-acetonitrile binary solutions using the conductometric method

Majid Rezayi, Yook Heng Lee, Mahnaz M. Abdi, Norfadila M D Noran, Chakavak Esmaeili, Seyedeh Belin Tavakoly Sany, Aishah Salleh, Leila Narimani, Naghmeh saadati, Faezeh Tajalli

Research output: Contribution to journalArticle

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Abstract

The complexation reactions between tris(2pyridyl) methylamine, tpm with Cu2+, Fe2+, Fe3+ and Cr3+, cations, were examined in acetonitrile-water (AN-H2O) binary mixtures. This research has been studied at different temperatures (15, 25 and 35°C) by applying conductometric method. In all cases, tpm forms 1:1 complexes with these cations. The stability constant of the complexes were obtained from fitting the molar conductivity curves using a computer program, Genplot. The non-linear behavior which was discovered for variations of log Kf of the complexes versus the composition of the mixed solvents was discussed in terms of changing the chemical and physical properties of the constituent solvents when they mix with one another. The values of thermodynamic parameters, standard enthalpy (δH°c) and standard entropy (δS°c) for formation of the complexes were obtained from temperature dependence of the stability constants using the van't Hoff plot. The results show that the complexes are both enthalpy and entropy stabilized. The selectivity order of the tpm towards metal cations at 25°C in pure H2O is: (tpm-Cr3+) > (tpm-Fe2+) > (tpm-Cu2+) > (tpm-Fe3+). However, the selectivity order of the tpm towards metal cations at 25°C in mol% AN = 34.08 is: (tpm-Cr3+) > (tpm- Fe3+) > (tpm-Fe2+) > (tpm-Cu2+). In conclusion, the selectivity order for all complexes are changing as well as the composition of the solvent mixtures also changed.

Original languageEnglish
Pages (from-to)6922-6932
Number of pages11
JournalInternational Journal of Electrochemical Science
Volume8
Issue number5
Publication statusPublished - 2013

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Acetonitrile
Cations
Positive ions
Thermodynamics
Water
Enthalpy
Entropy
Metals
Binary mixtures
Complexation
Chemical analysis
Chemical properties
Computer program listings
Physical properties
Temperature
acetonitrile
methylamine

Keywords

  • Acetonitrile-water
  • Conductometric method
  • Tris(2pyridyl) methylamine
  • Van't Hoff plot

ASJC Scopus subject areas

  • Electrochemistry

Cite this

A thermodynamic study on the complex formation between tris(2-pyridyl)methylamine (tpm) with fe2+, fe3+, cu2+ and cr3+ cations in water-acetonitrile binary solutions using the conductometric method. / Rezayi, Majid; Lee, Yook Heng; Abdi, Mahnaz M.; Noran, Norfadila M D; Esmaeili, Chakavak; Tavakoly Sany, Seyedeh Belin; Salleh, Aishah; Narimani, Leila; saadati, Naghmeh; Tajalli, Faezeh.

In: International Journal of Electrochemical Science, Vol. 8, No. 5, 2013, p. 6922-6932.

Research output: Contribution to journalArticle

Rezayi, Majid ; Lee, Yook Heng ; Abdi, Mahnaz M. ; Noran, Norfadila M D ; Esmaeili, Chakavak ; Tavakoly Sany, Seyedeh Belin ; Salleh, Aishah ; Narimani, Leila ; saadati, Naghmeh ; Tajalli, Faezeh. / A thermodynamic study on the complex formation between tris(2-pyridyl)methylamine (tpm) with fe2+, fe3+, cu2+ and cr3+ cations in water-acetonitrile binary solutions using the conductometric method. In: International Journal of Electrochemical Science. 2013 ; Vol. 8, No. 5. pp. 6922-6932.
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abstract = "The complexation reactions between tris(2pyridyl) methylamine, tpm with Cu2+, Fe2+, Fe3+ and Cr3+, cations, were examined in acetonitrile-water (AN-H2O) binary mixtures. This research has been studied at different temperatures (15, 25 and 35°C) by applying conductometric method. In all cases, tpm forms 1:1 complexes with these cations. The stability constant of the complexes were obtained from fitting the molar conductivity curves using a computer program, Genplot. The non-linear behavior which was discovered for variations of log Kf of the complexes versus the composition of the mixed solvents was discussed in terms of changing the chemical and physical properties of the constituent solvents when they mix with one another. The values of thermodynamic parameters, standard enthalpy (δH°c) and standard entropy (δS°c) for formation of the complexes were obtained from temperature dependence of the stability constants using the van't Hoff plot. The results show that the complexes are both enthalpy and entropy stabilized. The selectivity order of the tpm towards metal cations at 25°C in pure H2O is: (tpm-Cr3+) > (tpm-Fe2+) > (tpm-Cu2+) > (tpm-Fe3+). However, the selectivity order of the tpm towards metal cations at 25°C in mol{\%} AN = 34.08 is: (tpm-Cr3+) > (tpm- Fe3+) > (tpm-Fe2+) > (tpm-Cu2+). In conclusion, the selectivity order for all complexes are changing as well as the composition of the solvent mixtures also changed.",
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author = "Majid Rezayi and Lee, {Yook Heng} and Abdi, {Mahnaz M.} and Noran, {Norfadila M D} and Chakavak Esmaeili and {Tavakoly Sany}, {Seyedeh Belin} and Aishah Salleh and Leila Narimani and Naghmeh saadati and Faezeh Tajalli",
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T1 - A thermodynamic study on the complex formation between tris(2-pyridyl)methylamine (tpm) with fe2+, fe3+, cu2+ and cr3+ cations in water-acetonitrile binary solutions using the conductometric method

AU - Rezayi, Majid

AU - Lee, Yook Heng

AU - Abdi, Mahnaz M.

AU - Noran, Norfadila M D

AU - Esmaeili, Chakavak

AU - Tavakoly Sany, Seyedeh Belin

AU - Salleh, Aishah

AU - Narimani, Leila

AU - saadati, Naghmeh

AU - Tajalli, Faezeh

PY - 2013

Y1 - 2013

N2 - The complexation reactions between tris(2pyridyl) methylamine, tpm with Cu2+, Fe2+, Fe3+ and Cr3+, cations, were examined in acetonitrile-water (AN-H2O) binary mixtures. This research has been studied at different temperatures (15, 25 and 35°C) by applying conductometric method. In all cases, tpm forms 1:1 complexes with these cations. The stability constant of the complexes were obtained from fitting the molar conductivity curves using a computer program, Genplot. The non-linear behavior which was discovered for variations of log Kf of the complexes versus the composition of the mixed solvents was discussed in terms of changing the chemical and physical properties of the constituent solvents when they mix with one another. The values of thermodynamic parameters, standard enthalpy (δH°c) and standard entropy (δS°c) for formation of the complexes were obtained from temperature dependence of the stability constants using the van't Hoff plot. The results show that the complexes are both enthalpy and entropy stabilized. The selectivity order of the tpm towards metal cations at 25°C in pure H2O is: (tpm-Cr3+) > (tpm-Fe2+) > (tpm-Cu2+) > (tpm-Fe3+). However, the selectivity order of the tpm towards metal cations at 25°C in mol% AN = 34.08 is: (tpm-Cr3+) > (tpm- Fe3+) > (tpm-Fe2+) > (tpm-Cu2+). In conclusion, the selectivity order for all complexes are changing as well as the composition of the solvent mixtures also changed.

AB - The complexation reactions between tris(2pyridyl) methylamine, tpm with Cu2+, Fe2+, Fe3+ and Cr3+, cations, were examined in acetonitrile-water (AN-H2O) binary mixtures. This research has been studied at different temperatures (15, 25 and 35°C) by applying conductometric method. In all cases, tpm forms 1:1 complexes with these cations. The stability constant of the complexes were obtained from fitting the molar conductivity curves using a computer program, Genplot. The non-linear behavior which was discovered for variations of log Kf of the complexes versus the composition of the mixed solvents was discussed in terms of changing the chemical and physical properties of the constituent solvents when they mix with one another. The values of thermodynamic parameters, standard enthalpy (δH°c) and standard entropy (δS°c) for formation of the complexes were obtained from temperature dependence of the stability constants using the van't Hoff plot. The results show that the complexes are both enthalpy and entropy stabilized. The selectivity order of the tpm towards metal cations at 25°C in pure H2O is: (tpm-Cr3+) > (tpm-Fe2+) > (tpm-Cu2+) > (tpm-Fe3+). However, the selectivity order of the tpm towards metal cations at 25°C in mol% AN = 34.08 is: (tpm-Cr3+) > (tpm- Fe3+) > (tpm-Fe2+) > (tpm-Cu2+). In conclusion, the selectivity order for all complexes are changing as well as the composition of the solvent mixtures also changed.

KW - Acetonitrile-water

KW - Conductometric method

KW - Tris(2pyridyl) methylamine

KW - Van't Hoff plot

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JO - International Journal of Electrochemical Science

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