Effect of the central frames and substituents attached to N atoms on extraction ability of podand-type extractants

Sasaki, Yuji  ; Kitatsuji, Yoshihiro  ; Sugo, Yumi; Tsubata, Yasuhiro   ; Suzuki, Tomoya; Kimura, Takaumi ; Morita, Yasuji  

The eight amide extractants including podand-types, which introduce oxygen, nitrogen and sulfur donor atoms in their central frame, are synthesized and their D values for actinide extraction are compared. The central frame affect greatly on their extractability and it is clear that diglycolamide (DGA) has the highest extractability among extractants used here. In addition, DGA having the different length of alkyl chain or phenyl groups attached to amidic N atoms are obtained and the effect of these substituents is studied. Due to the steric hindrance or hydrogen bond, DGA with long and branched alkyl chains, phenyl group, and proton give relatively low D values.