caa a22 4500 445328487 CHVBK 20180317142729.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10953-011-9730-2 doi (NATIONALLICENCE)springer-10.1007/s10953-011-9730-2 Complexation of 4′-Nitrobenzo-15-crown-5 with Zn2+, Mn2+, Cr3+ and Sn4+ Cations in Acetonitrile-Ethanol Binary Mixtures [Elektronische Daten] [Fatemeh Hesami, Gholam Rounaghi, Massoumeh Mohajeri, Somayeh Tarahomi] The complexation reactions of 4′-nitrobenzo-15-crown-5 (4′NB15C5) with Zn2+, Mn2+, Cr3+ and Sn4+ cations were studied in acetonitrile-ethanol (AN-EtOH) binary solvent mixtures at different temperatures by the electrical conductometry method. The stability constants of the resulting 1:1 complexes were determined from computer fitting of the conductance versus mole ratio data. The results show that the selectivity order of 4′NB15C5 for the metal cations in the AN-EtOH (mol-%AN=76) binary solvent at 298.15K is: Cr3+>Mn2+≈Zn2+>Sn4+, but the selectivity order changes with the composition of the mixed solvents. A nonlinear relationship was observed between the stability constants (log 10 K f) of these complexes and the composition of the AN-EtOH binary solvents. The corresponding thermodynamic parameters $(\Delta H_{\mathrm{c}}^{\mathrm{o}}, \Delta S_{\mathrm{c}}^{\mathrm{o}})$ were obtained from the temperature dependence of the stability constants using van't Hoff plots. The results show that the values and also the sign of these parameters are influenced by the nature and composition of the mixed solvents. Springer Science+Business Media, LLC, 2011 4′-Nitrobenzo-15-crown-5 nationallicence Zn2+ nationallicence Mn2+ nationallicence Cr3+ nationallicence Sn4+ nationallicence Acetonitrile-ethanol nationallicence Conductometry nationallicence Hesami Fatemeh Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran aut Rounaghi Gholam Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran aut Mohajeri Massoumeh Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran aut Tarahomi Somayeh Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/8(2011-09-01), 1408-1417 0095-9782 40:8<1408 2011 40 10953 https://doi.org/10.1007/s10953-011-9730-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9730-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hesami Fatemeh Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran aut NATIONALLICENCE 700 1- Rounaghi Gholam Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran aut NATIONALLICENCE 700 1- Mohajeri Massoumeh Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran aut NATIONALLICENCE 700 1- Tarahomi Somayeh Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/8(2011-09-01), 1408-1417 0095-9782 40:8<1408 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer