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Chemical properties of positive singly charged astatine ion in aqueous solution

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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.

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Authors and Affiliations

  1. Joint Institute for Nuclear Research, Dubna, (USSR)

    M. Milanov, V. Doberenz, V. A. Khalkin & A. Marinov

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  1. M. Milanov
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  2. V. Doberenz
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  3. V. A. Khalkin
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  4. A. Marinov
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Milanov, M., Doberenz, V., Khalkin, V.A. et al. Chemical properties of positive singly charged astatine ion in aqueous solution. Journal of Radioanalytical and Nuclear Chemistry, Articles 83, 291–299 (1984). https://doi.org/10.1007/BF02037143

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  • DOI: https://doi.org/10.1007/BF02037143

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