Chemical Properties of Astatine. I

  title={Chemical Properties of Astatine. I},
  author={G. Johnson and R. Leininger and E. Segr{\`e}},
  journal={Journal of Chemical Physics},
This work is a report on studies of the chemistry of astatine on a tracer scale, using the various methods of tracer chemistry. A general discussion of preparation of materials and analytical methods is included. The properties of astatine and its solutions as they appear in work on a tracer scale are discussed. Migration experiments show that astatine when ionized in aqueous solution is negatively charged. Electro chemical, solvent extraction, and carrying studies are presented. In general, (a… Expand
Solvent distribution studies of the chemistry of astatine
Abstract Certain aspects of the chemistry of the positive oxidation states of astatine have been investigated by solvent distribution studies. The existence of a chlorocomplex, probably AtCl2−, hasExpand
The Chemistry of Astatine
Publisher Summary This chapter highlights the chemical study of astatine. Astatine, as the heaviest member of the family of halogens, forms a number of compounds in which the element has differentExpand
Zur Extraktion definierter Astatformen
During solvent extraction of (is well as of astatine compounds with higher oxidation states like the astatine species are changed into astatine of the oxidation state zero at the phase boundaryExpand
Zur anorganischen Chemie des monovalenten Astats
There is given a review on the level of astatine chemistry in oxydation state +1. According to the position of astatine in the periodic system At(I) has “metallic” properties. They may be seen in theExpand
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
Characterization of At- species in simple and biological media by high performance anion exchange chromatography coupled to gamma detector.
High performance anion exchange chromatography (HPAEC) coupled to a gamma detector (γ) was used to evaluate astatine species under reducing conditions and confirmed the existence of one species bearing one negative charge in the pH range 2-7.5. Expand
Astatine: Its Organonuclear Chemistry and Biomedical Applications
Publisher Summary Astatine, the fifth and heaviest member of the Periodic Table Group VIIB (the halogens), is the earth's rarest naturally occurring element. Many aspects of the nuclear physics, andExpand
Analytical Chemistry of Astatine
Astatine (At), element 85, has no stable isotopes. Its longest-lived isotope, 210At, has a half-life of only 8.3 h and a specific activity of 1.8 Ci/µg. Consequently, studies of At chemistry haveExpand
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
Synthesis of [211At]4-astato-L-phenylalanine by dihydroxyboryl-astatine substitution reaction in aqueous solution
A novel method wherein astatination was realized via the substitution of 211At for a dihydroxyboryl group coupled to phenylalanine, which did not require any organic solvents or toxic reagents and is suitable for clinical applications. Expand


Astatine: The Element of Atomic Number 85
IN 1940, we prepared the isotope of mass 211 of element 85 by bombarding bismuth with alpha particles accelerated in the 60-in. cyclotron of the Radiation Laboratory of the University of California1.
The (4n+1) Radioactive Series
The disintegration products of U(^233) have been investigated and the main route of the 4n+l series outlined as follows: (Formula diagram)
Das Element 85 in den natürlichen Zerfallsreihen
ZusammenfassungAusgehend von den kurzlebigen Folgeprodukten der Radiumemanation konnte eine neue α-Aktivität nachgewiesen werden und aus ihrem zeitlichen Verlauf sowie ihrer Energie wurdeExpand