Astatine-211At)ICoordination chemistry
SummaiyThe natuie and ptopeities of inorganic "' At-species formed in aqueous solutions under alkaline, neutral, acidic and oxidative conditions are studied through extraction of At with a variety of organic solvents, followed by the determination of the cjuomatographic, re-extraction and interaction behaviour of the extracted activity. It is concluded from the R{ values (on SiO,) and the different affinities for a large amount of additives, that the extracted activity -formerly denoted as At-zero -exists of AtX Compounds that may form AtXL^ complexes, depending on the kind of solvent (L) used.
SUMMARYAromatic astatine compounds can be prepared under mild conditions in high yields by reaction of astatine with aromatic mercury compounds. Compared to direct electrophilic astatination this procedure is an easy and clean method for the introduction of astatine in aromatic compounds.
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SUMMARYSeveral "At-astatopyrimidines (5-At-uraci1, 5-Atcytosine and their nucleosides and nucleotides includinq DNA and RNA) have been synthesized in high radiochemical yields by reaction of 211At/12 and the correspondinq chloromercury compounds. Also some astato-steroids (6-Atcholesterol and 2-and 4-astatoestradiol) have been prepared by this method. The stability in vitro was determined under different conditions in comDarison with the analogous iodo compounds.
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