| Project/Area Number |
16K18351
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Nuclear engineering
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| Research Institution | Tokyo Institute of Technology (2017)
Japan Atomic Energy Agency (2016) |
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Principal Investigator |
Nakase Masahiko 東京工業大学, 科学技術創成研究院, 研究員 (70744332)
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 溶媒抽出 / 有機合成 / 単結晶X線構造解析 / 放射光EXAFS / f元素 / アクチノイド / ランタノイド / 単結晶Ｘ線構造解析 / f元素分離 / イオン認識 |
|---|
| Outline of Final Research Achievements |
In the treatment of high-level radioactive waste, the separation of trivalent lanthanides (Ln(III)) from trivalent actinides (An(III)) is effective to minimize the burden for vitrification and deep geological disposal. In this study, crystallography, extended X-ray absorption fine structure and UV titration were performed to elucidate the relationship between complex structure and coordination strength to develop appropriate ligands for specific f-block elements. In case of symmetrical 2,2'-bipyridyl(Bpy) and 1,10-phenanthroline(Phen), the decreasing ionic radius from light to heavy Ln led to decreases in the Ln-N(Bpy) and Ln-N(Phen) distances, while logb simply increased. However, unsymmetrical N-methyl-N-tolyl-1,10-phenanthroline-2-carboxamide(MeTol-PTA) showed a local maximum in logb and the crystal structures indicated that the bulky phenanthroline moiety of MeTol-PTA may not allow N(MeTol-PTA) to come close to Ln which resulted in suitable arrangement of N and O for specific Ln.
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