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Volume and compressibility effects in the formation of metal-EDTA complexes

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Abstract

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.

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Authors and Affiliations

  1. Max-Planck-Institute for Biophysical Chemistry, D-37077, Gottingen, Germany

    Besik I. Kankia & Theodor Funck

  2. Scientific Center of Radiobiology and Radiation Ecology, Georgian Academy of Sciences, Telavi St. 51, 380003, Tbilisi, Republic of Georgia

    Theodor Funck

  3. National Institute of Bioscience and Human-Technology, 1-1 Higashi, Tsukuba, 305, Ibaraki Pref., Japan

    Hatsuho Uedaira

  4. Center for Colloid Science and Biomaterials, Department of Chemistry University College Dublin, Dublin 4, Belfield, Ireland

    Vitaly A. Buckin

Authors
  1. Besik I. Kankia
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  2. Theodor Funck
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  3. Hatsuho Uedaira
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  4. Vitaly A. Buckin
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Kankia, B.I., Funck, T., Uedaira, H. et al. Volume and compressibility effects in the formation of metal-EDTA complexes. J Solution Chem 26, 877–888 (1997). https://doi.org/10.1007/BF02768263

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  • DOI: https://doi.org/10.1007/BF02768263

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