Conductometric studies of the thermodynamics for complexation of 1,1-diethyl-3-(4-methoxybenzoyl)thiourea and cobalt(II) cation in aqueous binary mixtures of polar organic solvents

Khairi Suhud, Yook Heng Lee, Madjid Rezayi, Aisha A. Al-Abbasi, Siti Aishah Hasbullah, Musa Ahmad, Mohammad Kassim

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Abstract

The complexation reaction of Co2+ (M) and the 1,1-diethyl-3-(4-methoxybenzoyl)thiourea (L) ligand in the binary mixtures: acetonitrile-dimethylsulfoxide (MeCN-DMSO), acetonitrile-dichloromethane (MeCN-DCM), water-dimethylsulfoxide (H2O-DMSO) and acetonitrile-water (MeCN-H2O), was investigated using a conductometric method at temperatures of (288.15, 298.15, 308.15 and 318.15) K. In all cases, the conductance data showed that the stoichiometry of the neutral complex formed between M and L is 1:3 [M:3L], which indicates that the Co2+ ion was oxidized to Co3+ during the reaction. The best estimate of the stability constant, log10 K f, = 3.31 for the [CoL3] complex, was observed with the MeCN-DCM (20:80 %) binary mixture at 298.15 K. The values of the thermodynamic parameters (i.e., ΔGc ° and Δ Sc °) for the formation of the [CoL3] complex were obtained from the temperature dependence of the stability constant via van't Hoff plots. The results show that, in most cases, the [CoL3] complexes are enthalpy destabilized but entropy stabilized. The values and signs of the thermodynamic parameters are affected by the nature and composition of the mixed solvents but are independent of the temperature.

Original languageEnglish
Pages (from-to)181-192
Number of pages12
JournalJournal of Solution Chemistry
Volume44
Issue number2
DOIs
Publication statusPublished - 2015

Fingerprint

Thiourea
thioureas
Binary mixtures
Dimethyl Sulfoxide
Cobalt
Complexation
Thermodynamics
Organic solvents
binary mixtures
acetonitrile
Cations
cobalt
cations
thermodynamics
Methylene Chloride
Temperature
Water
Entropy
trucks
Stoichiometry

Keywords

  • Benzoylthiourea
  • Binary solvent mixture
  • Cobalt(II)
  • Conductometry
  • Thermodynamics
  • van't Hoff

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

@article{314fb9f65d66487ba9214f1b547af913,
title = "Conductometric studies of the thermodynamics for complexation of 1,1-diethyl-3-(4-methoxybenzoyl)thiourea and cobalt(II) cation in aqueous binary mixtures of polar organic solvents",
abstract = "The complexation reaction of Co2+ (M) and the 1,1-diethyl-3-(4-methoxybenzoyl)thiourea (L) ligand in the binary mixtures: acetonitrile-dimethylsulfoxide (MeCN-DMSO), acetonitrile-dichloromethane (MeCN-DCM), water-dimethylsulfoxide (H2O-DMSO) and acetonitrile-water (MeCN-H2O), was investigated using a conductometric method at temperatures of (288.15, 298.15, 308.15 and 318.15) K. In all cases, the conductance data showed that the stoichiometry of the neutral complex formed between M and L is 1:3 [M:3L], which indicates that the Co2+ ion was oxidized to Co3+ during the reaction. The best estimate of the stability constant, log10 K f, = 3.31 for the [CoL3] complex, was observed with the MeCN-DCM (20:80 {\%}) binary mixture at 298.15 K. The values of the thermodynamic parameters (i.e., ΔGc ° and Δ Sc °) for the formation of the [CoL3] complex were obtained from the temperature dependence of the stability constant via van't Hoff plots. The results show that, in most cases, the [CoL3] complexes are enthalpy destabilized but entropy stabilized. The values and signs of the thermodynamic parameters are affected by the nature and composition of the mixed solvents but are independent of the temperature.",
keywords = "Benzoylthiourea, Binary solvent mixture, Cobalt(II), Conductometry, Thermodynamics, van't Hoff",
author = "Khairi Suhud and Lee, {Yook Heng} and Madjid Rezayi and Al-Abbasi, {Aisha A.} and Hasbullah, {Siti Aishah} and Musa Ahmad and Mohammad Kassim",
year = "2015",
doi = "10.1007/s10953-015-0308-2",
language = "English",
volume = "44",
pages = "181--192",
journal = "Journal of Solution Chemistry",
issn = "0095-9782",
publisher = "Springer New York",
number = "2",

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TY - JOUR

T1 - Conductometric studies of the thermodynamics for complexation of 1,1-diethyl-3-(4-methoxybenzoyl)thiourea and cobalt(II) cation in aqueous binary mixtures of polar organic solvents

AU - Suhud, Khairi

AU - Lee, Yook Heng

AU - Rezayi, Madjid

AU - Al-Abbasi, Aisha A.

AU - Hasbullah, Siti Aishah

AU - Ahmad, Musa

AU - Kassim, Mohammad

PY - 2015

Y1 - 2015

N2 - The complexation reaction of Co2+ (M) and the 1,1-diethyl-3-(4-methoxybenzoyl)thiourea (L) ligand in the binary mixtures: acetonitrile-dimethylsulfoxide (MeCN-DMSO), acetonitrile-dichloromethane (MeCN-DCM), water-dimethylsulfoxide (H2O-DMSO) and acetonitrile-water (MeCN-H2O), was investigated using a conductometric method at temperatures of (288.15, 298.15, 308.15 and 318.15) K. In all cases, the conductance data showed that the stoichiometry of the neutral complex formed between M and L is 1:3 [M:3L], which indicates that the Co2+ ion was oxidized to Co3+ during the reaction. The best estimate of the stability constant, log10 K f, = 3.31 for the [CoL3] complex, was observed with the MeCN-DCM (20:80 %) binary mixture at 298.15 K. The values of the thermodynamic parameters (i.e., ΔGc ° and Δ Sc °) for the formation of the [CoL3] complex were obtained from the temperature dependence of the stability constant via van't Hoff plots. The results show that, in most cases, the [CoL3] complexes are enthalpy destabilized but entropy stabilized. The values and signs of the thermodynamic parameters are affected by the nature and composition of the mixed solvents but are independent of the temperature.

AB - The complexation reaction of Co2+ (M) and the 1,1-diethyl-3-(4-methoxybenzoyl)thiourea (L) ligand in the binary mixtures: acetonitrile-dimethylsulfoxide (MeCN-DMSO), acetonitrile-dichloromethane (MeCN-DCM), water-dimethylsulfoxide (H2O-DMSO) and acetonitrile-water (MeCN-H2O), was investigated using a conductometric method at temperatures of (288.15, 298.15, 308.15 and 318.15) K. In all cases, the conductance data showed that the stoichiometry of the neutral complex formed between M and L is 1:3 [M:3L], which indicates that the Co2+ ion was oxidized to Co3+ during the reaction. The best estimate of the stability constant, log10 K f, = 3.31 for the [CoL3] complex, was observed with the MeCN-DCM (20:80 %) binary mixture at 298.15 K. The values of the thermodynamic parameters (i.e., ΔGc ° and Δ Sc °) for the formation of the [CoL3] complex were obtained from the temperature dependence of the stability constant via van't Hoff plots. The results show that, in most cases, the [CoL3] complexes are enthalpy destabilized but entropy stabilized. The values and signs of the thermodynamic parameters are affected by the nature and composition of the mixed solvents but are independent of the temperature.

KW - Benzoylthiourea

KW - Binary solvent mixture

KW - Cobalt(II)

KW - Conductometry

KW - Thermodynamics

KW - van't Hoff

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U2 - 10.1007/s10953-015-0308-2

DO - 10.1007/s10953-015-0308-2

M3 - Article

AN - SCOPUS:84925489456

VL - 44

SP - 181

EP - 192

JO - Journal of Solution Chemistry

JF - Journal of Solution Chemistry

SN - 0095-9782

IS - 2

ER -