FIELD: chemistry.
SUBSTANCE: invention relates to organic chemistry, namely to diamides of 4,7-disubstituted 1,10-phenanthroline-2,9-dicarboxylic acids, where R is radical selected from lower alkyls group or aryl containing 6 carbon atoms, and X denotes n-pentoxy, chlorine or phenyl. Invention also relates to a method of producing said dicarboxylic acid diamides, to intermediate compound - 4,7-di-pentoxy-1,10-phenanthroline-2,9-dicarboxylic acid and method for production thereof, extraction mixture based on diamine of 4,7-disubstituted 1,10-phenanthroline-2,9-dicarboxylic acids.
EFFECT: produced novel diamides of dicarboxylic acids for use during extraction and concentration of radionuclides.
6 cl, 3 tbl, 3 ex
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