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Journal Articles

Unusually kinetically inert monocationic neptunyl complex with a fluorescein-modified 1,10-phenanthroline-2,9-dicarboxylate ligand; Specific separation and detection in gel electrophoresis

Yamagata, Kazuhito*; Ouchi, Kazuki; Marumo, Kazuki*; Tasaki-Handa, Yuiko*; Haraga, Tomoko; Saito, Shingo*

Inorganic Chemistry, 62(2), p.730 - 738, 2023/01

 Times Cited Count:1 Percentile:85.35(Chemistry, Inorganic & Nuclear)

The inert NpO$$_{2}$$$$^{+}$$ complex with a fluorescein-modified phenanthroline-2,9-dicarboxylic acid was found by kinetic selection using polyacrylamide gel electrophoresis (PAGE) from a small chemical library. The small spontaneous dissociation rate constant of 8$$times$$10$$^{-6}$$ s$$^{-1}$$ (the half-life of 23 hours) was determined. This is the singly-charged NpO$$_{2}$$$$^{+}$$ complex exhibiting unusual kinetic inertness in aqueous solution, one million times slower than widely accepted fast kinetics of neptunyl complexes. Selective fluorescence detection of NpO$$_{2}$$$$^{+}$$ was achieved in PAGE with a detection limit of 68 pmol dm$$^{-3}$$(17 fg). This system was successfully applied to simulated spent nuclear fuel and high-level radioactive waste samples.

Journal Articles

Rotation of complex ions with ninefold hydrogen coordination studied by quasielastic neutron scattering and first-principles molecular dynamics calculations

Omasa, Yoshinori*; Takagi, Shigeyuki*; Toshima, Kento*; Yokoyama, Kaito*; Endo, Wataru*; Orimo, Shinichi*; Saito, Hiroyuki*; Yamada, Takeshi*; Kawakita, Yukinobu; Ikeda, Kazutaka*; et al.

Physical Review Research (Internet), 4(3), p.033215_1 - 033215_9, 2022/09

Journal Articles

Characterization of adsorbed alkali metal ions in 2:1 type clay minerals from first-principles metadynamics

Ikeda, Takashi; Suzuki, Shinichi; Yaita, Tsuyoshi

Journal of Physical Chemistry A, 119(30), p.8369 - 8375, 2015/07

 Times Cited Count:23 Percentile:68.34(Chemistry, Physical)

Adsorption states of alkali metal ions in three kinds of 2:1 type clay minerals are systematically investigated via first-principles-based metadynamics. Our reconstructed free energy surfaces in a two dimensional space of coordination numbers specifically employed as collective variables for describing the interlayer cations show that an inner-sphere (IS) complex is preferentially formed for Cs$$^{+}$$ in the 2:1 type trioctahedral clay minerals with saponitelike compositions, where lighter alkali ions show a tendency to form an outer-sphere one instead. The strong preference for an IS complex observed for Cs$$^{+}$$ is found to result partially from the capability of recognizing selectively Cs$$^{+}$$ ions at basal O atoms with the Lewis basicity significantly enhanced by the isomorphic substitution in tetrahedral sheets.

Journal Articles

Electrochemical properties of uranium(VI) complexes with multidentate ligands in $$N,N$$-dimethylformamide

Kim, S.-Y.; Asakura, Toshihide; Morita, Yasuji; Ikeda, Yasuhisa*

Journal of Alloys and Compounds, 408-412, p.1291 - 1295, 2006/02

 Times Cited Count:10 Percentile:54.88(Chemistry, Physical)

The electrochemical reactions of UO$$_{2}$$($$beta$$-diketonato)$$_{2}$$DMF, UO$$_{2}$$(trop)$$_{2}$$DMF and UO$$_{2}$$(sap)(DMF)$$_{2}$$, (DMF = N,N-dimethylformamide, $$beta$$-diketonate = thenoyltrifluoroacetonate (ttfa), benzoyltrifluoroacetonate (btfa), and dibenzoylmethanate(dbm), trop = tropolonate, and sap = 2-salicylidenaminophenolate) complexes in DMF solution containing tetrabutyl ammonium perchlorate as a supporting electrolyte have been studied with cyclic voltammetry. These uranyl(VI) complexes were found to be quasi-reversibly reduced to U(V) species. The formal redox potentials (E$$^{o}$$, ${it vs}$. ferrocene/ferrocenium) for U(VI)/U(V) couples were determined to be -1.18 V for UO$$_{2}$$(ttfa)$$_{2}$$DMF, -1.18 V for UO$$_{2}$$(btfa)$$_{2}$$DMF, -1.46 V for UO$$_{2}$$ (dbm)$$_{2}$$DMF, -1.46 V for UO$$_{2}$$(trop)$$_{2}$$DMF, and -1.59 V for UO$$_{2}$$(sap)(DMF)$$_{2}$$.

Journal Articles

Resonant O K$$alpha$$ emission spectroscopy of layered manganate La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$

Agui, Akane; K$"a$$"a$mbre, T.*; S${aa}$the, C.*; Nordgren, J.*; Usuda, Manabu; Saito, Tomohiko*; Moritomo, Yutaka*

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.589 - 592, 2005/06

 Times Cited Count:1 Percentile:5.7(Spectroscopy)

Current research in the perovskite and layered perovskite-type manganese oxides has expanded to include the study of electronic and magnetic properties such as the colossal magnetoresistance (CMR), orbital ordering and charge ordering. The O K$$alpha$$ soft X-ray emission and absorption spectra (XES and XAS) of La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$ were measured at selected excitation energies in order to investigate the electronic structure. The measurements were carried out by using a soft X-ray emission spectrometer at beamline BW3 at HASYLAB, Germany. The dependence of O K$$alpha$$ XES on excitation-energy was observed. It is attributed the different site of oxygen ions.

Journal Articles

Resonant Mn $$L$$ Emission spectra of layered manganite La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$

Agui, Akane; Butorin, S. M.*; K$"a$$"a$mbre, T.*; S${aa}$the, C.*; Saito, Tomohiko*; Moritomo, Yutaka*; Nordgren, J.*

Journal of the Physical Society of Japan, 74(6), p.1772 - 1776, 2005/06

 Times Cited Count:8 Percentile:48.38(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Electrochemical redox reactions of uranium(VI) complexes with multidentate ligands in dimethyl sulfoxide

Kim, S.-Y.; Asakura, Toshihide; Morita, Yasuji; Uchiyama, Gunzo*; Ikeda, Yasuhisa*

Radiochimica Acta, 93(2), p.75 - 81, 2005/02

 Times Cited Count:8 Percentile:53.35(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Laser raman spectroscopy of some uranyl trinitrate complexes (MUO$$_{2}$$(NO$$_{3}$$)$$_{3}$$;M=Cs,Rb,K,NH$$_{4}$$)

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Spectrochimica Acta, Part A, 51(3), p.309 - 318, 1995/00

no abstracts in English

Journal Articles

A Positron lifetime study of defects in neutron-irradiated Si

A.Li*; H.Huang*; D.Li*; S.Zheng*; H.Du*; S.Zhu*; Iwata, Tadao

Japanese Journal of Applied Physics, 32(3), p.1033 - 1038, 1993/03

 Times Cited Count:8 Percentile:44.72(Physics, Applied)

no abstracts in English

Journal Articles

Neutronics properties of JMTR LEU core

Nagaoka, Yoshiharu; Saito, Minoru;

Transactions of the American Nuclear Society, 66, p.454 - 455, 1992/11

no abstracts in English

Journal Articles

Graphite core structures and their structural design criteria in the HTTR

Iyoku, Tatsuo; Shiozawa, Shusaku; Ishihara, Masahiro; ; Oku, Tatsuo*

Nucl. Eng. Des., 132, p.23 - 30, 1991/00

 Times Cited Count:23 Percentile:89.76(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Coprecipitation of plutonium with magnetite and ferrite

Radioisotopes, 35(11), p.571 - 576, 1986/11

no abstracts in English

Journal Articles

Vibrational assignments of crystalline waters in some uranyl halide complexes

Journal of Inorganic and Nuclear Chemistry, 41(8), p.1145 - 1147, 1979/00

 Times Cited Count:7

no abstracts in English

Journal Articles

Normal coordinate analysis of some uranyl pentafluoride complexes

Spectrochimica Acta, Part A, 35A(1), p.99 - 104, 1979/00

no abstracts in English

Journal Articles

Infrared spectroscopic studies of some uranyl nitrate complexes

Spectrochimica Acta, Part A, 35A(11), p.1283 - 1288, 1979/00

no abstracts in English

Journal Articles

IR spectroscopic studies of some uranyl tetrachloride complexes

Journal of Inorganic and Nuclear Chemistry, 40(7), p.1369 - 1374, 1978/07

 Times Cited Count:20

no abstracts in English

Journal Articles

Liquid-liquid extraction of the EDTA complexes of lanthanides with a quaternary ammonium salt

;

Analytica Chimica Acta, 96, p.211 - 214, 1978/00

 Times Cited Count:0

no abstracts in English

Journal Articles

Raman spectroscopic studies of some uranyl nitrate complexes

J.Coord.Chem., 8, p.35 - 39, 1978/00

 Times Cited Count:11

no abstracts in English

JAEA Reports

ROTAX; A Nonlinear Optimization Program By Axes Rotation Method

JAERI-M 7255, 30 Pages, 1977/09

JAERI-M-7255.pdf:0.87MB

no abstracts in English

24 (Records 1-20 displayed on this page)