caa a22 4500 445328096 CHVBK 20180317142728.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10953-011-9651-0 doi (NATIONALLICENCE)springer-10.1007/s10953-011-9651-0 Study of Complex Formation of Dibenzo-18-Crown-6 with Ce3+, Y3+, $\mathrm{UO}_{2}^{2 +}$ and Sr2+ Cations inAcetonitrile-Dioxane Binary Solvent Mixtures [Elektronische Daten] [G. Rounaghi, M. Mohajeri, S. Tarahomi, R. Rahmanian] The complexation reactions of dibenzo-18-crown-6 (DB18C6) with Ce3+, Y3+, $\mathrm{UO}_{2}^{2 +}$ and Sr2+ cations were studied in acetonitrile-dioxane (AN-dioxane) binary solvent solutions at different temperatures by the conductometric method. The stability constants of the resulting 1:1 complexes were determined from computer fitting of the conductance-mole ratio data. The results show that dibenzo-18-crown-6 does not exhibit selectivity for the cation whose ionic size is closest to the cavity size of this macrocyclic ligand in AN-dioxane binary solvent solutions. Anonlinear relationship was observed between the stability constants (log 10 K f) of these complexes with the composition of the AN-dioxane binary solvent. Values of thermodynamic parameters ($\Delta H_{\mathrm{c}}^{\circ}, \Delta S_{\mathrm{c}}^{\circ}$) for complexation reactions were obtained from the temperature dependence of the stability constants. The results show that the values along with the sign of these parameters are influenced by the nature and composition of the mixed solvent. Springer Science+Business Media, LLC, 2011 Dibenzo-18-crown-6 nationallicence Ce3+ nationallicence Y3+ nationallicence $\mathrm{UO}_{2}^{2 +}$ nationallicence Sr2+ nationallicence Acetonitrile-dioxane nationallicence Conductometry nationallicence Rounaghi G. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran aut Mohajeri M. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran aut Tarahomi S. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran aut Rahmanian R. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/3(2011-03-01), 377-389 0095-9782 40:3<377 2011 40 10953 https://doi.org/10.1007/s10953-011-9651-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9651-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rounaghi G. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran aut NATIONALLICENCE 700 1- Mohajeri M. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran aut NATIONALLICENCE 700 1- Tarahomi S. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran aut NATIONALLICENCE 700 1- Rahmanian R. Department of Chemistry, Faculty of Sciences, Islamic Azad University, Mashhad Branch, Mashhad, Iran aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/3(2011-03-01), 377-389 0095-9782 40:3<377 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer