Abstract
The complexation reaction between 4′-nitrobenzo-15-crown-5 (4′-NB15C5) with La3+ cation was studied in ethanol-acetonitrile (EtOH-AN), ethanol-methylacetate (EtOH-MeOAc), ethanol-1,2 dichloroethane (EtOH-DCE), and ethanol-nitrobenzene (EtOH-NB) binary mixed solvent solutions at different temperatures using the conductometric method. The results show that in most cases, the stoichiometry of the complex formed between 4′-NB15C5 and La3+ cation is 1: 1 [ML]. The stability constant of (4′-nitrobenzo-15C5La)3+ complex changes by the nature and composition of the solvents systems. The stability order of (4′-nitrobenzo-15C5La)3+ complex in the binary mixed solvents with 10 mol % of ethanol at 25°C was found to be: EtOH-MeOAc > EtOH-NB > EtOH-AN ~ EtOH-DCE. A non-linear behavior was observed for variations of logK f of the complex in terms of the solvent composition. The standard values of the thermodynamic parameters (ΔH °c ΔS °c ) for complexation reaction were obtained from temperature dependence of the stability constant of the complex and the results show that, in most solvent systems, the complexation reaction between La3+ and 4′-NB15C5 is entropy stabilized, but from enthalpy view point, except in a few cases, it is athermic.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
C. J. Pedersen, J. Am. Chem. Soc. 89, 2495 (1967).
C. J. Pedersen, J. Am. Chem. Soc. 89, 7017 (1967).
R. M. Izatt, K. Pawlak, J. S. Bradshaw, and R. L. Bruening, Chem. Rev. 91, 1721 (1991).
J. C. Lee, Synthesis of Novel Crown Ether Compounds and Ionomer Modification of Nafion, PhD Dissertation, 1992.
G. J. Persy, A. R. Behets, A. R. Bervoets, et al., Sem. Dialysis 19, 195 (2006).
W. Brzyska, Lantanowce i aktynowce (WNT, Warszawa, 1996).
GENPLOT, Computer Graphic Service, USA (1989).
G. H. Rounaghi, G. H. Eshaghi, and E. Ghiamati, Talanta, 44, 275 (1997).
Author information
Authors and Affiliations
Corresponding author
Additional information
The article is published in the original.
Rights and permissions
About this article
Cite this article
Asgharpour, S., Rounaghi, G.H., Mohajeri, M. et al. Complexation process between La3+ cation and 4′-nitrobenzo-15-crown-5 in some binary mixed non-aqueous solvent. Russ. J. Inorg. Chem. 60, 1292–1297 (2015). https://doi.org/10.1134/S0036023615100034
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0036023615100034