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Journal Articles

Comparison of nuclear medicine therapeutics targeting PSMA among alpha-emitting nuclides

Kaneda-Nakashima, Kazuko*; Shirakami, Yoshifumi*; Kadonaga, Yuichiro*; Watabe, Tadashi*; Oe, Kazuhiro*; Yin, X.*; Haba, Hiromitsu*; Shirasaki, Kenji*; Kikunaga, Hidetoshi*; Tsukada, Kazuaki; et al.

International Journal of Molecular Sciences (Internet), 25(2), p.933_1 - 933_14, 2024/01

Journal Articles

Crystallographic and/or magnetic properties of neutral and cationic uranium(IV) sandwiched phthalocyanine complexes

Tabata, Chihiro; Watanabe, Hirohito*; Shirasaki, Kenji*; Sunaga, Ayaki*; Fukuda, Takamitsu*; Li, D.*; Yamamura, Tomoo*

Journal of Molecular Structure, 1277, p.134870_1 - 134870_8, 2023/04

 Times Cited Count:0 Percentile:0(Chemistry, Physical)

Neutral and cationic U(IV) sandwiched phthalocyanine (Pc) complexes were prepared. The neutral species, UPc$$_{2}$$, was obtained by the reaction of UCl$$_{4}$$] and phthalonitrile, and the [UPc$$_{2}$$][BF$$_{4}$$] crystals were grown by electrolysis. The structures of the complexes were determined crystallographically. A U(IV) ion has two $$5f$$ electrons, which carry a magnetic moment localized at the U sites, making the complex magnetically active. The magnetic susceptibility measurement of UPc$$_{2}$$ revealed that the system was paramagnetic with local magnetic moments down to 2 K, but these magnetic moments were suppressed, possibly by a ligand field effect. The paramagnetism was also confirmed by the magnetization curve without hysteresis. The cationic complex, [UPc$$_{2}$$][BF$$_{4}$$]] crystalized in a tetragonal structure with the space group $$P4nc$$, in which the UPc$$_{2}$$ molecules stacked along the tetragonal $$c$$-axis. The structure was similar to that of [LnPc$$_{2}$$][BF$$_{4}$$]], but with distinct disorder in the stacking plane. The stabilities of the crystal and molecular structures and the electronic configurations of UPc$$_{2}$$ and [UPc$$_{2}$$][BF$$_{4}$$]] were evaluated via the $$ab initio$$ calculations that included the multiconfigurational nature of the actinide element.

Journal Articles

Influence of additives on low-temperature hydrothermal synthesis of UO$$_{2+x}$$ and ThO$$_2$$

Tabata, Chihiro; Shirasaki, Kenji*; Sakai, Hironori; Sunaga, Ayaki*; Li, D.*; Konaka, Mariko*; Yamamura, Tomoo*

CrystEngComm (Internet), 24(19), p.3637 - 3648, 2022/05

 Times Cited Count:2 Percentile:53.04(Chemistry, Multidisciplinary)

Journal Articles

Homogeneity of (U, $$M$$)O$$_2$$ ($$M$$ = Th, Np) prepared by supercritical hydrothermal synthesis

Shirasaki, Kenji*; Tabata, Chihiro*; Sunaga, Ayaki*; Sakai, Hironori; Li, D.*; Konaka, Mariko*; Yamamura, Tomoo*

Journal of Nuclear Materials, 563, p.153608_1 - 153608_11, 2022/05

 Times Cited Count:2 Percentile:56.43(Materials Science, Multidisciplinary)

We focused on the direct synthesis of (U, $$M$$)O$$_2$$ solid solution ($$M$$=Th, Np) by extending our recent progress in hydrothermal synthesis with additives. The homogeneity of the (U, $$M$$)O$$_2$$ ($$M$$ = Th, Np) systems prepared by supercritical hydrothermal reactions was investigated through crystallographic analysis based on Vegard's law, and the $$^{23}$$Na nuclear magnetic resonance (NMR) measurement of (U, Np, Na)O$$_2$$ solid solutions. Our experimental and analytical results revealed that (i) an optimal additive is ammonium carbonate and starting uranium valence is IV in the case of (U, Th)O$$_{2+x}$$, and (ii) an optimal additive is ethanol and starting uranium valence is VI in the case of (U, Np)O$$_{2+x}$$, for producing the homogeneous solid solutions by hydrothermal synthesis.

Journal Articles

Supercritical hydrothermal synthesis of UO$$_{2+x}$$; Stoichiometry, crystal shape and size, and homogeneity observed using $$^{23}$$Na-NMR spectroscopy of (U, Na)O$$_{2+x}$$

Tabata, Chihiro*; Shirasaki, Kenji*; Sunaga, Ayaki*; Sakai, Hironori; Li, D.*; Konaka, Mariko*; Yamamura, Tomoo*

CrystEngComm (Internet), 23(48), p.8660 - 8672, 2021/12

 Times Cited Count:5 Percentile:66.03(Chemistry, Multidisciplinary)

The hydrothermal synthesis of pure uranium dioxide under supercritical water (SCW) conditions was investigated. The nonstoichiometry, crystallite size and morphology of the UO$$_{2+x}$$ particles were investigated. The SCW hydrothermal synthesis may be a promising method for producing homogeneous UO$$_{2+x}$$ and its solid solutions with well-defined nonstoichiometries ($$x$$), shapes, and sizes.

Oral presentation

Challenge to improve the $$^{229}$$Th isomer energy measurement with TES calorimeters

Tanaka, Keita*; Hirano, Kosuke*; Yamaguchi, Atsushi*; Muramatsu, Haruka*; Hayashi, Tasuku*; Yuasa, Naoki*; Nakamura, Keisuke; Takimoto, Misaki; Haba, Hiromitsu*; Shirasaki, Kenji*; et al.

no journal, , 

Oral presentation

Electronic structure of actinide intermetallic compound ThRh$$_6$$Ge$$_4$$; de Haas - van Alphen study

Haga, Yoshinori; Yamamoto, Etsuji; Nakamura, Ai*; Honda, Fuminori*; Aoki, Dai*; Matsumoto, Yuji*; Yamamura, Tomoo*; Shirasaki, Kenji*; Yamagami, Hiroshi*

no journal, , 

Oral presentation

Crystal structure and magnetic properties of uranium-based intermetallic compound U$$_2$$Pt$$_6$$Al$$_{15}$$

Haga, Yoshinori; Yamamoto, Etsuji; Matsumoto, Yuji*; Shirasaki, Kenji*

no journal, , 

Oral presentation

Fermi surfaces of noncentrosymmetric ThRh$$_6$$Ge$$_4$$

Haga, Yoshinori; Yamamoto, Etsuji; Nakamura, Ai*; Honda, Fuminori*; Aoki, Dai*; Matsumoto, Yuji*; Yamamura, Tomoo*; Shirasaki, Kenji*; Yamagami, Hiroshi*; Sumida, Kazuki

no journal, , 

no abstracts in English

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