Reaction modeling of ion-pairing extraction of various meatal ions with NTAamide(C6) extractant from hydrochloric acid solution

Kinoshita, Ryoma; Sasaki, Yuji  ; Kaneko, Masashi   ; Matsumiya, Masahiko*; Shinoku, Kota*; Shiroishi, Hidenobu*

Many metal ions are stable in hydrochloric acid solutions as anionic species; diamidic-extractants containing tertiary amino nitrogen atom, such as NTAamide (hexaalkyl-nitrilotriacetamide), are normally protonated in acidic solutions and become cationic extractants. In this study, the ion-pair extraction reactions of metal chloride anions with cationic NTAamide(C6) extractant were investigated. In addition, we attempted to predict the distribution ratio by combining the stability constants of metal chloride complexes and DFT calculations, and compared the results with experimental values.