Russian Journal of Physical Chemistry A

, Volume 91, Issue 13, pp 2569–2577 | Cite as

Study of Kryptofix5 Complexation with La3+ Cation in Several Individual and Binary Nonaqueous Solvents Using Conductometric Method

  • Setareh Akbari
  • Razieh Sanavi Khoshnood
  • Elaheh Hatami
Structure of Matter and Quantum Chemistry

Abstract

Complexatio of the La3+ cation with 1,13-bis(8-quinolyl)-1,4,7,10,13-pentaoxatridecane(Kryptofix5) was studied in pure solvents acetonitrile (AN), methanol (MeOH), nitrobenzene (NB), tetrahydrofuran (THF), methyl acetate (MeOAC) and in various binary solvent mixtures of AN–MeOH, AN–NB, AN–THF, and AN–MeOAC systems at different temperatures using the conductometric method. The stoichiometry of the complex was found to be 1 : 1 (ML). In all cases, the variation of the log kf with composition of the solvent was non-linear. This behavior is probably due to a change in the structure of these binary mixed solvents as the composition of the medium is varied. The stability order of the complex in pure nonaqueous solvents at 25°C increases in the order: AN > THF > MeOAC > MeOH > NB. The values of thermodynamic data (ΔH c °,ΔS c °) formation of (Kryptofix5.La)3+ complex are definitely solvent dependent.

Keywords

(Kryptofix5.La)3+ complexes acetonitrile–methanol acetonitrile–nitrobenzene acetonitrile–tetrahydrofuran acetonitrile–methyl acetate conductometry 

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • Setareh Akbari
    • 1
  • Razieh Sanavi Khoshnood
    • 1
  • Elaheh Hatami
    • 1
  1. 1.Department of Chemistry, Mashhad BranchIslamic Azad UniversityMashhadIran

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