Zur anorganischen Chemie des monovalenten Astats

Abstract

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 the existence of similar changed cation At(0)+ in acid water solutions and in complex formation reactions with halogenides to anionic forms and with thioureas its derivates and N-acylthioureas to cationic forms which are almost very stable in water solutions. The information on optimal synthese conditions, composition, existence and stability area of At(I)-complexes and on the calculation of stability constants mainly based on electromigration in free electrolys solutions.