Thermodynamic studies of complex formation between Co(SALEN) ionophore with chromate (II) ions in AN-H 2O binary solutions by the conductometric method

Majid Rezayi, Saeid Ahmadzadeh, Anuar Kassim, Yook Heng Lee

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The complexation reaction between CrO 4 2- anion with macrocyclic ligand, N, N′Bis(salicylidene) ethylenediamino cobalt(II) (Co(SALEN)), was studied in acetonitrile water (AN.H 2O) binary mixed systems at 25°C. The conductance data show that the stoichiometry of the complexes formed between (Co(SALEN)) with CrO 4 2- anion in most cases is 1:1 [M:L], but in the case of the 89.70% mol AN-H2O binary solution 1:2 [M:L 2] complex is formed in solutions. The values of stability constant (logK f) of (Co(SALEN)-CrO 4 2-) complex at 25°C which was obtained from conductometric data, shows that the nature and also the composition of the solvent systems are important factors that are effective on the stability and even the stoichiometry of the complex formed in solutions. In all cases, a non-linear relationship is observed for the changes of stability constants (log K f) of the (Co(SALEN)-CrO 4 2-) complexes versus the composition of the binary mixed solvents.

Original languageEnglish
Pages (from-to)6350-6359
Number of pages10
JournalInternational Journal of Electrochemical Science
Volume6
Issue number12
Publication statusPublished - Dec 2011

Fingerprint

Ionophores
Chromates
Thermodynamics
Ions
Stoichiometry
Anions
Negative ions
Cobalt
Complexation
Acetonitrile
Chemical analysis
Ligands
Hydrogen
Water

Keywords

  • Acetonitrile-water (AN-H O) binary mixed systems
  • Chromate (II)
  • Conductometry
  • N, N′Bis(salicylidene) ethylenediamino cobalt(II)

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Thermodynamic studies of complex formation between Co(SALEN) ionophore with chromate (II) ions in AN-H 2O binary solutions by the conductometric method. / Rezayi, Majid; Ahmadzadeh, Saeid; Kassim, Anuar; Lee, Yook Heng.

In: International Journal of Electrochemical Science, Vol. 6, No. 12, 12.2011, p. 6350-6359.

Research output: Contribution to journalArticle

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