Chemical properties of positive singly charged astatine ion in aqueous solution

  title={Chemical properties of positive singly charged astatine ion in aqueous solution},
  author={M. Milanov and V. Doberenz and V. Khalkin and A. Marinov},
  journal={Journal of Radioanalytical and Nuclear Chemistry},
AbstractThe 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… Expand
13 Citations
Investigation of astatine(III) hydrolyzed species: experiments and relativistic calculations.
The hydrolysis thermodynamic constant, extrapolated to zero ionic strength, was determined to be 10(-1.9) and supported by two-component relativistic quantum calculations and therefore allows disclosing unambiguously the structure of the formed species. Expand
Determination of stability constants between complexing agents and At(I) and At(III) species present at ultra-trace concentrations
A competition method is proposed to determine the complexation constants between At(I) and At(III) species and complexing agents. The method, tested with an inorganic ligand, thiocyanate ion (SCN−),Expand
Speciation of astatine reacted with oxidizing and reducing reagents by thin layer chromatography: formation of volatile astatine
Radio-chromatography was conducted by using the astatine radionuclides 209,210,211At produced in the 7Li induced reaction of 209Bi. The speciation of dissolved astatine chemical species of astatideExpand
The EDTA complexes of astatine
Using the electromigration method the monopositive astatine ion has been shown to form EDTA [H4L] complexes in 0.1M NaClO4 solution at pH=3–10. The ion mobility of the AtL3− complex is 5.60/23/x10−4Expand
Preparation of no-carrier-added 211At solutions by a simple dry distillation method in the 209Bi(4He, 2n)211At reaction
211 At was produced in the 209 Bi( 4 He, 2n) 211 At reaction. The yield was separated from the irradiated bismuth target by a simple method, based on dry distillation. The optimized conditions of theExpand
Synthesis and first characterization of cationic At/I/-compounds with selenium-containing neutral ligands
The formation of cationic astatine /I/-coordination compounds with selenium-containing neutral ligands is described. The detection of compound formation and first physico-chemical data on theExpand
Thin layer chromatography for astatine and iodine in solutions prepared by dry distillation
The astatine radionuclides 208,209,210,211At and the iodine radionuclides 120,121,123I were simultaneously produced by 7Li beam irradiation of a stack of lead and tin targets. The astatine and theExpand
Origin of Asymmetric Solvation Effects for Ions in Water and Organic Solvents Investigated Using Molecular Dynamics Simulations: The Swain Acity-Basity Scale Revisited.
The asymmetric solvation of ions is investigated using molecular dynamics simulations, and the Swain scale is reformulated into a new scale involving an asymmetry parameter Σ, positive for acitic solvents and negative for basitic ones, and a polarity parameter Π, which characterizes asymmetry in an absolute sense. Expand
The Electrochemistry of Halogens
The sections in this article are Introduction The Electrochemistry of Fluorine Introduction Electrochemical Generation of Fluorine Electrofluorination in Synthesis Gas and Ion Sensors forExpand
Handling of Astatine
Astatine, the fifth halogen and homologue of iodine, is one of the best studied radioelements. Since its discovery in 1940 by Corson, MacKenzie and Segre [1 to 5] after more than 16 years ofExpand


Study of the H+ and OH− Hydrated Ions by the CNDO/2 Method
The ions obtained by hydration of H+ and OH−, e.g., H3O+, H5O2, H7O3, H9O4+, H3O2−, H5O3−, and H7O4− have been studied theoretically using the CNDO/2 method. The results indicate chain structures areExpand