caa a22 4500 477139051 CHVBK 20180405111727.0 cr unu---uuuuu 170330e19970901xx s 000 0 eng 10.1007/BF02768263 doi (NATIONALLICENCE)springer-10.1007/BF02768263 Volume and compressibility effects in the formation of metal-EDTA complexes [Elektronische Daten] [Besik Kankia, Theodor Funck, Hatsuho Uedaira, Vitaly Buckin] We used precise measurements of ultrasonic velocity and density to study the complexation of ethylendiaminetetraacetic acid (EDTA) with Mg2+, Ca2+, Sr2+, and Ba2+ at 25‡C and pH 12. From these measurements we obtained the changes in the molar concentration increment of the ultrasonic velocity δA, the apparent molar adiabatic compressibility δKsΦ, and the apparent molar volume δVΦ of complex formation. The hydration contributions δ(AVh) to the volume effect of binding range from 39.6 to 46.6 cm3-mol-1 while the hydration contribution to the adiabatic compressibility change in the binding, δ(δKh), ranges from 103.9X 10-4 to 131.1 X 10-4 cm3-mol-1-bar-1. These data are interpreted in terms of dehydration of interacting molecules,i.e., transfer of water molecules from the hydration shells of cations and EDTA into the bulk water. The ratio δ(δVh)/ δ(δVh) is in the range 0.35 to 0.38 bar, indicating a dominant contribution from the dehydration of charged atomic groups in the volume and the compressibility effects of complex formation. Plenum Publishing Corporation, 1997 EDTA complexes nationallicence alkaline earth metal ions nationallicence ultrasonic velocity nationallicence compressibility nationallicence volume effect nationallicence hydration changes nationallicence Kankia Besik Max-Planck-Institute for Biophysical Chemistry, D-37077, Gottingen, Germany aut Funck Theodor Max-Planck-Institute for Biophysical Chemistry, D-37077, Gottingen, Germany aut Uedaira Hatsuho National Institute of Bioscience and Human-Technology, 1-1 Higashi, Tsukuba, 305, Ibaraki Pref., Japan aut Buckin Vitaly Center for Colloid Science and Biomaterials, Department of Chemistry University College Dublin, Dublin 4, Belfield, Ireland aut Journal of Solution Chemistry Springer US 26/9(1997-09-01), 877-888 0095-9782 26:9<877 1997 26 10953 https://doi.org/10.1007/BF02768263 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02768263 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kankia Besik Max-Planck-Institute for Biophysical Chemistry, D-37077, Gottingen, Germany aut NATIONALLICENCE 700 1- Funck Theodor Max-Planck-Institute for Biophysical Chemistry, D-37077, Gottingen, Germany aut NATIONALLICENCE 700 1- Uedaira Hatsuho National Institute of Bioscience and Human-Technology, 1-1 Higashi, Tsukuba, 305, Ibaraki Pref., Japan aut NATIONALLICENCE 700 1- Buckin Vitaly Center for Colloid Science and Biomaterials, Department of Chemistry University College Dublin, Dublin 4, Belfield, Ireland aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US 26/9(1997-09-01), 877-888 0095-9782 26:9<877 1997 26 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer