JOPSS - Search Results

Journal Articles

Speciation and separation of platinum(IV) polynuclear complexes in concentrated nitric acid solutions

Suzuki, Tomoya*; Otsubo, Ukyo*; Ogata, Takeshi*; Shiwaku, Hideaki; Kobayashi, Toru; Yaita, Tsuyoshi; Matsuoka, Mitsuaki*; Murayama, Norihiro*; Narita, Hirokazu*

Dalton Transactions (Internet), 50(33), p.11390 - 11397, 2021/09

https://doi.org/10.1039/D1DT01392K

Times Cited Count：2 Percentile：21.56(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Systematic comparison of the structure of homoleptic tetradentate N $_{2}$ O $_{2}$ -type Schiff base complexes of tetravalent f-elements (M(IV) = Ce, Th, U, Np, and Pu) in solid state and in solution

Radoske, T.*; Kloditz, R.*; Fichter, S.*; Mrz, J.*; Kaden, P.*; Patzschke, M.*; Schmidt, M.*; Stumpf, T.*; Walter, O.*; Ikeda, Atsushi

Dalton Transactions (Internet), 49(48), p.17559 - 17570, 2020/12

https://doi.org/10.1039/d0dt03405c

Times Cited Count：10 Percentile：65.05(Chemistry, Inorganic & Nuclear)

Journal Articles

-radiation and H $_{2}$ O $_{2}$ induced oxidative dissolution of uranium(IV) oxide in aqueous solution containing phthalic acid

Kumagai, Yuta; Jonsson, M.*

Dalton Transactions (Internet), 49(6), p.1907 - 1914, 2020/02

https://doi.org/10.1039/c9dt03952j

Times Cited Count：0 Percentile：0.01(Chemistry, Inorganic & Nuclear)

This study aims to reveal possible involvements of organic acids in the oxidative dissolution of UO $_{2}$ . Using phthalic acid as a model compound, we have measured adsorption on UO $_{2}$ and investigated effects on the reaction between H $_{2}$ O $_{2}$ and UO $_{2}$ and on oxidative dissolution induced by -irradiation. Significant adsorption of phthalic acid was observed even at neutral pH. However, the reaction between H $_{2}$ O $_{2}$ and UO $_{2}$ in phthalic acid solution induced oxidative dissolution of U(VI) similarly to aqueous bicarbonate solution. These results indicate that even though phthalic acid adsorbs on the UO $_{2}$ surface, it is not involved in the interfacial reaction by H $_{2}$ O $_{2}$ . In contrast, the dissolution of U by irradiation was inhibited in aqueous phthalic acid solution, whereas H $_{2}$ O $_{2}$ generated by radiolysis was consumed by UO $_{2}$ . The inhibition suggests that radical species derived from phthalic acid was involved in the redox reaction process of UO $_{2}$ .

Journal Articles

Magnetic, thermal, and neutron diffraction studies of a coordination polymer; bis(glycolato)cobalt(II)

Nakane, Tomohiro*; Yoneyama, Shota*; Kodama, Takeshi*; Kikuchi, Koichi*; Nakao, Akiko*; Ohara, Takashi; Higashinaka, Ryuji*; Matsuda, Tatsuma*; Aoki, Yuji*; Fujita, Wataru*

Dalton Transactions (Internet), 48(1), p.333 - 338, 2019/01

https://doi.org/10.1039/C8DT04358B

Times Cited Count：2 Percentile：11.34(Chemistry, Inorganic & Nuclear)

Journal Articles

Computational chemical analysis of Eu(III) and Am(III) complexes with pnictogen-donor ligands using DFT calculations

Kimura, Taiki*; Kaneko, Masashi; Watanabe, Masayuki; Miyashita, Sunao*; Nakashima, Satoru*

Dalton Transactions (Internet), 47(42), p.14924 - 14931, 2018/11

https://doi.org/10.1039/C8DT01973H

Times Cited Count：9 Percentile：49.17(Chemistry, Inorganic & Nuclear)

We demonstrated density functional calculations of Eu(III) and Am(III) complexes with pnictogen-donor (X) ligands, CH $_{3}$ ) $_{2}$ X-CH $_{2}$ -CH $_{2}$ -X(CH $_{3}$ ) $_{2}$ (X = N, P, As and Sb). We investigated the optimized structures of the cmoplexes and the Gibbs energy differences in the complex formation reactions. Those results indicated that the N- and P-donor ligands have Am(III) ion selectivity over Eu(III) ion, especially, the P-donor ligand showed the highest selectivity. The tendency of the Am(III)/Eu(III) selectivity by the pnictogen-dono ligands was found to be comparable to that of soft acid classification in hard and soft acids and bases rule. Mulliken's spin population analysis indicated that the bonding property between the metal ion and the pnictogen atoms correlated with the Am(III)/Eu(III) selectivity. In particular, the participation of f-orbital electrons of the metal ion in the covalency was indicated to have an important role for the selectivity.

Journal Articles

The Separation mechanism of Am(III) from Eu(III) by diglycolamide and nitrilotriacetamide extraction reagents using DFT calculations

Kaneko, Masashi; Watanabe, Masayuki; Matsumura, Tatsuro

Dalton Transactions, 45(43), p.17530 - 17537, 2016/11

AA2016-0311.pdf:1.49MB

https://doi.org/10.1039/C6DT03002E

Times Cited Count：33 Percentile：87.63(Chemistry, Inorganic & Nuclear)

Relativistic density functional calculations were applied to study the separation behaviors of Am(III) ion from Eu(III) ion by diglycolamide (DGA) and nitrilotriacetamide (NTA) ligands in order to understand the difference in the separation mechanism of their reagents. The complexation reaction was modeled on the basis of previous experimental studies. The calculated energies based on stabilization by complex formation at the ZORA-B2PLYP/SARC level predicted that the DGA reagent preferably coordinated to Eu(III) ion when compared with Am(III) ion. In contrast, the NTA reagent selectively coordinated to Am(III) ion when compared with Eu(III) ion. These results reproduced the experimental selectivity of DGA and NTA ligands toward Eu(III) and Am(III) ions. Mulliken's population analyses implied that the difference in the contribution of the bonding property between the f-orbital of Am and donor atoms determined the comparative stability of Eu and Am complexes.

Journal Articles

Proton-exchange mechanism of specific Cs $^{+}$ adsorption lattice defect sites of Prussian blue filled with coordination and crystallization water molecules

Ishizaki, Manabu*; Akiba, Sae*; Otani, Asako*; Hoshi, Yuji*; Ono, Kenta*; Matsuba, Mayu*; Togashi, Takanari*; Kanaizuka, Katsuhiko*; Sakamoto, Masatomi*; Takahashi, Akira*; et al.

Dalton Transactions, 42(45), p.16049 - 16055, 2013/12

https://doi.org/10.1039/c3dt51637g

Times Cited Count：178 Percentile：99.58(Chemistry, Inorganic & Nuclear)

We have revealed the fundamental mechanism of specific Cs $^{+}$ adsorption into Prussian blue (PB) in order to develop high-performance PB-based Cs $^{+}$ adsorbents in the wake of the Fukushima nuclear accident. We compared two types of PB nanoparticles with formulae of Fe $^{III}$ $_{4}$ [Fe $^{II}$ (CN) $_{6}$ ]3xH $_{2}$ O (x = 10-15) (PB-1) and (NH $_{4}$ )0.70Fe $^{III}$ 1.10[Fe $^{II}$ (CN) $_{6}$ ]1.7H $_{2}$ O (PB-2) with respect to the Cs $^{+}$ adsorption ability. The synthesised PB-1, by a common stoichiometric aqueous reaction between 4Fe $^{3+}$ and 3[Fe $^{II}$ (CN) $_{6}$ ] $^{4-}$ , showed much more efficient Cs $^{+}$ adsorption ability than did the commercially available PB-2.

Journal Articles

Dinuclear complexes of tetravalent cerium in an aqueous perchloric acid solution

Ikeda, Atsushi*; Tsushima, Satoru*; Hennig, C.*; Yaita, Tsuyoshi; Bernhard, G.*

Dalton Transactions, 41(24), p.7190 - 7192, 2012/06

https://doi.org/10.1039/c2dt12406h

Times Cited Count：46 Percentile：88.91(Chemistry, Inorganic & Nuclear)

Journal Articles

Comparative investigation of the solution species [U(CO $_{3}$ ) $_{5}$ ] $^{6-}$ and the crystal structure of Na $_{6}$ [U(CO $_{3}$ ) $_{5}$ ]12H $_{2}$ O

Hennig, C.*; Ikeda, Atsushi; Emmerling, F.*; Kraus, W.*; Bernhard, G.*

Dalton Transactions, 39(15), p.3744 - 3750, 2010/04

https://doi.org/10.1039/b922624a

Times Cited Count：36 Percentile：81.24(Chemistry, Inorganic & Nuclear)

The coordination of the limiting U(IV) carbonate species in aqueous solution was investigated by comparing its structure parameters with those of the complex preserved in a crystal structure. The U(IV) carbonate complex in the crystal structure was identified as a [U(CO $_{3}$ ) $_{5}$ ] $^{6-}$ anionic complex. This monomeric anion complex forms a network with charge compensating Na+ cations and H $_{2}$ O ligands. U L3-edge EXAFS spectra were collected from the solid Na $_{6}$ [U(CO $_{3}$ ) $_{5}$ ]12H $_{2}$ O and the corresponding solution. The obtained data indicate the identity of the [U(CO $_{3}$ ) $_{5}$ ] $^{6-}$ complex in solid and solution states. The high negative charge of the [U(CO $_{3}$ ) $_{5}$ ] $^{6-}$ anionic complex is compensated by Na+ cations. In the solid state the Na+ cations form a bridging network between the [U(CO $_{3}$ ) $_{5}$ ] $^{6-}$ anion complex, while in the liquid state they seem to be located closer at the anionic complex anion.

Journal Articles

Cooperative intramolecular interaction of diazacrown ether bearing -diketone fragments on an ionic liquid extraction system

Shimojo, Kojiro; Okamura, Hiroyuki; Hirayama, Naoki*; Umetani, Shigeo*; Imura, Hisanori*; Naganawa, Hirochika

Dalton Transactions, 2009(25), p.4850 - 4852, 2009/07

A novel extractant -diketone-substituted diaza-18-crown-6 demonstrated very efficient extraction of Sr $^{2+}$ due to an intramolecular synergistic effect on the ionic liquid extraction system and recovery of Sr $^{2+}$ from the ionic liquid was successfully achieved under acidic conditions.

Journal Articles

Extraction behavior of lanthanides using a diglycolamide derivative TODGA in ionic liquids

Shimojo, Kojiro; Kurahashi, Kensuke; Naganawa, Hirochika

Dalton Transactions, 2008(37), p.5083 - 5088, 2008/10

https://doi.org/10.1039/b810277p

Times Cited Count：170 Percentile：99.32(Chemistry, Inorganic & Nuclear)

Liquid-liquid extraction of lanthanides from aqueous solutions into ionic liquids (ILs) has been investigated using -tetra(-octyl)diglycolamide (TODGA) as an extractant, and compared with that in the isooctane system. Application of ILs as extracting phase provided unprecedented enhancement of the extraction performance of TODGA for lanthanides compared with that of the isooctane system. Slope analysis confirmed that TODGA in ILs formed a 1:3 complex with La $^{3+}$ , Eu $^{3+}$ , or Lu $^{3+}$ . On the other hand, the molar ratios of species extracted into isooctane were 1:3 for La $^{3+}$ or 1:4 for Eu $^{3+}$ and Lu $^{3+}$ , depending on the atomic number of lanthanides. The transfer of lanthanides with TODGA into ILs proceeded via a cation-exchange mechanism, in contrast to ion pair extraction in the isooctane system. Furthermore, we clarified that TODGA provided the selectivity for middle lanthanides in the ILs systems, but heavier lanthanides in the isooctane system.

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Speciation and separation of platinum(IV) polynuclear complexes in concentrated nitric acid solutions

Systematic comparison of the structure of homoleptic tetradentate N $_{2}$ O $_{2}$ -type Schiff base complexes of tetravalent f-elements (M(IV) = Ce, Th, U, Np, and Pu) in solid state and in solution

-radiation and H $_{2}$ O $_{2}$ induced oxidative dissolution of uranium(IV) oxide in aqueous solution containing phthalic acid

Magnetic, thermal, and neutron diffraction studies of a coordination polymer; bis(glycolato)cobalt(II)

Computational chemical analysis of Eu(III) and Am(III) complexes with pnictogen-donor ligands using DFT calculations

The Separation mechanism of Am(III) from Eu(III) by diglycolamide and nitrilotriacetamide extraction reagents using DFT calculations

Proton-exchange mechanism of specific Cs $^{+}$ adsorption lattice defect sites of Prussian blue filled with coordination and crystallization water molecules

Dinuclear complexes of tetravalent cerium in an aqueous perchloric acid solution

Comparative investigation of the solution species [U(CO $_{3}$ ) $_{5}$ ] $^{6-}$ and the crystal structure of Na $_{6}$ [U(CO $_{3}$ ) $_{5}$ ]12H $_{2}$ O

Cooperative intramolecular interaction of diazacrown ether bearing -diketone fragments on an ionic liquid extraction system

Extraction behavior of lanthanides using a diglycolamide derivative TODGA in ionic liquids