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Chemical properties of positive singly charged astatine ion in aqueous solution

  • M. Milanov
  • V. Doberenz
  • V. A. Khalkin
  • A. Marinov
Article

Abstract

The mobility of oxidized astatine in solutions H(Na)ClO4 (μ=0.4 M) − 1·10−4M K2Cr2O7 has been measured at 25°C in the interval 0.63≤pH≤1.68. Under these conditions astatine migrates to the cathode only. The speed of the migration depends upon the concentration of hydrogen ions in solution: pH 1.68 Uc = 1.17 · 10-4 cm2 V-1 s-1 pH 0.63 Uc = 2.67 · 10-4 cm2 V-1 s-1

The effect agrees with the opinion that the singly charged cation of astatine formed in acidic solutions is a strong aquacomplex [(H2O)xAt]+ (x=1–2) (protonated hypoastatic acid). Deprotonation constant of this cation is Kdp=0.032±0.005. Specific properties of the astatine cation are given. They can be explained, probably, through the peculiarities of its structure.

Keywords

Hydrogen Physical Chemistry Migration Aqueous Solution Inorganic Chemistry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Akadémiai Kiadó 1984

Authors and Affiliations

  • M. Milanov
    • 1
  • V. Doberenz
    • 1
  • V. A. Khalkin
    • 1
  • A. Marinov
    • 1
  1. 1.Joint Institute for Nuclear ResearchDubna(USSR)

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