2011 Fiscal Year Final Research Report
Synthesis and physical property of uranium-containing porous coordination polymer
| Project/Area Number |
22760679
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
AOYAGI Noboru 独立行政法人日本原子力研究開発機構, 原子力基礎工学研究部門, 研究員 (80446400)
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| Project Period (FY) |
2010 – 2011
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| Keywords | ウラニル錯体 / イオン液体 / クロミック材料 / レーザー分光 |
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| Research Abstract |
The colors of the multi-valent complexes of uranium, neptunium and plutonium strongly depend on the oxidation state of the metal ion, and it is often possible to determine the oxidation state of the metal ion from the color of its solutions. Given the fact that uranium is only weakly radioactive due to the long half-lives of its naturally occurring isotopes, uranium-containing compounds could find some applications as advanced materials.
In the present study, temperature-dependent yellow-to-red colour changes of uranyl thiocyanate complexes with 1-alkyl-3-methylimidazolium cations have been studied by different spectroscopic methods and this phenomenon is attributed to changes in the local environment of the uranyl ion, including the coordination number, as well as to cation. anion interactions.
The structure contained disorder in three of the NCS^-anions and one C_2mim^+cation. The U-O bond distances(1.766(8), 1.765(9) A) and the O-U-O bond angle(171.2(9) 1°) are in the range expected for the uranyl moiety. The mean U-N distance is 2.45 A which is close to that seen in[DPSH]_3[UO_2(SCN)_5](DPSH=2-pyridylthio-2-pyridinium) and Cs_3[UO_2(SCN)_5] which both have mean U-N distances of 2.45 A. However, in this structure there are large variations from the mean with much shorter distances(U-N=2.398(11) A) and large distances(U-N=2.513(10) A), Time-resolved luminescence spectra, at 77 K, of neat uranyl which have not been known for uranyl-thiocyanates. The anisotropic structure could play an important role in the chromic reactions. Due to the weak interaction between the thiocyanate and imidazolium cation, labile and flexible coordination geometries for thiocyanate are allowed.
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[Journal Article] Laser-induced fluorescence and infrared spectroscopic studies on the specific solvationof tri s(1-(2-thienyl)-4, 4, 4-trifluoro-1, 3-butanedionato)-europium(III) in an ionic liquid2012
Author(s)
H. Okamura, H. Sakae, K. Kidani, N. Hi rayama, N. Aoyagi, T. Saito, K. Shimojo, H. Naganawa, H. Imura
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Journal Title
Polyhedron
Volume: 31(1)
Pages: 748-753
DOI
Peer Reviewed
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