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Ogata, Takeshi*; Takeshita, Kenji*; Oaki, Hiroshi*; Inaba, Yusuke*; Mori, Atsunori*; Matsumura, Tatsuro; Nakano, Yoshio*
no journal, ,
N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) is one of the podand-type ligands with six nitrogen-donors and recognize the slight difference in the softness between Am(III) and Eu(III). We have tried to synthesize a novel extraction chromatographic agent, which exploit such feature of TPEN. The use of the polymer gel as a support of the extractant can be expect to suppress the elution of the extractant and keep the flexibility of extractant. N,N,N',N'-tetrakis-(4-propenyloxy-2-pyridylmethyl)ethylenediamine (TPPEN) which is TPEN analog introducing polymerizable group to pyridine ring was used as a cross-linker of N-isopropylacrylamide (NIPA). Furthermore, the TPPEN-NIPA gel on highly porous silica was prepared to improve the mechanical strength of the gel. These extraction chromatographic agents have been tested for the separation of Am(III) and Eu(III). Characterization and extraction performance of the extraction chromatographic agents will be described.
Kobayashi, Toru; Suzuki, Shinichi; Ikeda, Atsushi; Shiwaku, Hideaki; Okamoto, Yoshihiro; Akutsu, Kazuhiro; Yaita, Tsuyoshi
no journal, ,
In the development of efficient disposal processes of high level radioactive wastes, the chemical separation of trivalent actinides is one of the most important steps. To develop the An
/Ln separation reagent which allows high extractability in acidic condition, the combination of both nitrogen and oxygen donors has been proposed. Bearing this in mind, we have developed novel oxygen-nitrogen hetero donor ligand, N-alkyl-N-phenyl-1,10-phenanthroline-2-carboxamide (PTA), showing high extractability and selectivity for Am over Eu even in the acid condition. Thus, in this study, we investigated the complexation equilibria and structural character of the PTA complex by UV/vis spectroscopy, X-ray absorption fine structure, and X-ray crystallography, and concluded that the high extractability of PTA in acidic media is attributed to strong coordination of oxygen donor which prevents the protonation reaction toward nitrogen.