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Journal Articles

Isotope-selective microscale imaging of radioactive Cs without isobaric interferences using sputtered neutral mass spectrometry with two-step resonant ionization employing newly-developed Ti:Sapphire lasers

Sakamoto, Tetsuo*; Morita, Masato*; Kanenari, Keita*; Tomita, Hideki*; Sonnenschein, V.*; Saito, Kosuke*; Ohashi, Masaya*; Kato, Kotaro*; Iguchi, Tetsuo*; Kawai, Toshihide*; et al.

Analytical Sciences, 34(11), p.1265 - 1270, 2018/11

 Times Cited Count:8 Percentile:32.37(Chemistry, Analytical)

Journal Articles

Highly selective synergism for the extraction of lanthanoid(III) ions with $$beta$$-diketones and trioctylphosphine oxide in an ionic liquid

Okamura, Hiroyuki; Takagi, Hitomi*; Isomura, Taku*; Morita, Kotaro*; Nagatani, Hirohisa*; Imura, Hisanori*

Analytical Sciences, 30(3), p.323 - 325, 2014/03

 Times Cited Count:30 Percentile:74.49(Chemistry, Analytical)

Journal Articles

Synergistic effect of 18-crown-6 derivatives on chelate extraction of lanthanoids(III) into an ionic liquid with 2-thenoyltrifluoroacetone

Okamura, Hiroyuki; Hirayama, Naoki*; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Imura, Hisanori*

Analytical Sciences, 26(5), p.607 - 611, 2010/05

 Times Cited Count:54 Percentile:85.27(Chemistry, Analytical)

Oral presentation

Specific solvent effect of ionic liquids on the extraction of europium(III) with 2-thenoyltrifluoroacetone

Okamura, Hiroyuki; Morita, Kotaro*; Hirayama, Naoki*; Shimojo, Kojiro; Naganawa, Hirochika; Imura, Hisanori*

no journal, , 

no abstracts in English

Oral presentation

Synergistic ionic-liquid extraction of lanthanoid(III) with $$beta$$-diketone and hydrophobic neutral ligand; Specific effect of $$beta$$-diketones

Imura, Hisanori*; Okamura, Hiroyuki; Takagi, Hitomi*; Isomura, Taku*; Hatakeyama, Mizuki*; Morita, Kotaro*; Nagatani, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Selective separation of heavy lanthanoids by the synergistic ionic-liquid extraction with $$beta$$-diketones and a hydrophobic neutral ligand

Okamura, Hiroyuki; Takagi, Hitomi*; Isomura, Taku*; Hatakeyama, Mizuki*; Morita, Kotaro*; Nagatani, Hirohisa*; Imura, Hisanori*

no journal, , 

Oral presentation

Extraction behavior of trivalent metal ions into an ionic liquid with 2-mercaptopyridin ${it N}$-oxide

Eguchi, Ayano; Morita, Kotaro*; Okamura, Hiroyuki; Hirayama, Naoki*

no journal, , 

2-Mercaptopyridine ${it N}$-oxide (HSPyO) is a bidentate ligand with a hard O-donor and a soft S-donor. This ligand is expected to be effective in an ionic liquid (IL) chelate extraction because of its high solubility in ILs. In this study, we investigated the IL chelate extraction behavior of Al(III), Ga(III), and In(III) into ILs, 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imides ([C$$_{n}$$mim][Tf$$_{2}$$N], n = 2, 4, 8), using HSPyO as an extractant. The extraction selectivity order was In(III) $$>$$ Ga(III), whereas Al(III) was not extracted. Therefore, HSPyO was favorable for the extraction of soft In(III). The extractability order for solvents was ILs $$>$$ chloroform in the Ga(III) extraction, indicating that ILs exhibit high extraction performance. In addition, it was implied that the extracted species were the neutral complexes, M(SPyO)$$_{3}$$, for all metals.

Oral presentation

Extraction behavior of trivalent metals in ionic liquid chelate extraction using bidentate ligands

Eguchi, Ayano; Morita, Kotaro*; Okamura, Hiroyuki; Hirayama, Naoki*

no journal, , 

In chelate extraction of metal ions into conventional organic solvents, the metals are generally extracted as uncharged complexes. Moreover, coordinatively saturated (unhydrated) complexes are preferable as extracted species. In ionic liquid (IL) chelate extraction, on the contrary, also charged species or coordinatively unsaturated (hydrated) species can be extracted. In this study, we investigated the IL chelate extraction behavior of trivalent metal ions, Fe(III), Al(III), Ga(III) and In(III), into 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imides ([C$$_{n}$$mim][Tf$$_{2}$$N], n = 2, 4, 8) using 8-quinolinol (H$$^{+}$$Q$$^{-}$$) and 2-mercaptopyridine ${it N}$-oxide (H$$^{+}$$SPyO$$^{-}$$) as bidentate ligands. In the case of H$$^{+}$$Q$$^{-}$$, only uncharged M$$^{3+}$$Q$$_{3}$$$$^{3-}$$ was extracted into chloroform, whereas coordinatively unsaturated cationic complex [M$$^{3+}$$Q$$_{2}$$$$^{2-}$$]$$^{+}$$ was also extracted into ILs by ion exchange. In the case of H$$^{+}$$SPyO$$^{-}$$, it was implied that uncharged M$$^{3+}$$(SPyO)$$_{3}$$$$^{3-}$$ was extracted into both chloroform and ILs. Therefore, the extracted species depends on the ligands in ILs.

Oral presentation

Extraction of trivalent lanthanoids into various ionic liquids having different anions

Eguchi, Ayano; Okamura, Hiroyuki; Sugita, Tsuyoshi; Ueda, Yuki; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Hirayama, Naoki*

no journal, , 

In this study, the effect of the hydrophobicity and structure of an ionic liquid (IL) anion on the extraction of trivalent lanthanoid ions (Ln(III) = La, Nd, Eu, Dy, Lu) using 2-thenoyltrifluoroacetone (Htta) was investigated. Four 1-butyl-3-methylimidazolium bis(perfluoroalkanesulfonyl)imides with different perfluoroalkyl (Rf) chain length (n=0, 1, 2, 4) were synthesized and used as the extraction solvent. The extraction selectivity of Ln(III) was in the order of Lu $$doteq$$ Dy $$geq$$ Eu $$>$$ Nd $$>$$ La for all ILs. In addition, there was no significant difference in the extractability among ILs. The extracted species of each Ln(III) in these IL systems were investigated based on the slope of the plots of the logarithmic distribution ratio of Ln(III) as a function of aqueous phase pH. The results implied that the extracted species can be adjusted by Rf chain length of IL anions.

Oral presentation

Effect of chelating agent on ionic liquid chelate extraction of trivalent metals using bidentate ligands

Eguchi, Ayano; Morita, Kotaro*; Okamura, Hiroyuki; Hirayama, Naoki*

no journal, , 

In chelate extraction of metal ions into organic solvents, formation of their uncharged complexes with ligands is required. Moreover, coordinatively saturated (unhydrated) complexes are more preferable as extracted species. On the other hand, in ionic liquid chelate extraction, ionic liquid can extract charged species and coordinatively unsaturated (hydrated) species. In this study, the effects of bidentate ligands on ionic liquid chelate extraction of trivalent metal ions, Fe(III), Al(III), Ga(III) and In(III), into 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imides ([C$$_{n}$$mim][Tf$$_{2}$$N], n=2,4,8) was studied using 8-quinolinol (HQ) and 2-mercaptopyridine ${it N}$-oxide (HSPyO) as extractants. The extraction selectivity order for trivalent metal ions was Fe $$doteq$$ Ga $$geq$$ In $$geq$$ Al for HQ and Fe $$geq$$ In $$>$$ Ga $$gg$$ Al for HSPyO. Namely, HSPyO was favorable for extraction of In(III). The extractability of Ga(III) was in the order of [C$$_{2}$$mim][Tf$$_{2}$$N] $$>$$ [C$$_{4}$$mim][Tf$$_{2}$$N] $$>$$ [C$$_{8}$$mim][Tf$$_{2}$$N] $$>$$ chloroform for HSPyO, whereas reversed order was obtained for HQ. These results were seemed to be based on difference in concentration of deprotonated bidentate ligands in water.

Oral presentation

Resonant laser secondary neutral mass spectrometry for micro imaging of radioactive isotopes, 2

Tomita, Hideki*; Saito, Kosuke*; Ohashi, Masaya*; Sonnenschein, V.*; Kato, Kotaro*; Suzuki, So*; Iguchi, Tetsuo*; Morita, Masato*; Sakamoto, Tetsuo*; Kanenari, Keita*; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of perfluoroalkyl chain length of an ionic liquid anion in the ionic liquid chelate extraction of trivalent lanthanoids

Eguchi, Ayano; Okamura, Hiroyuki; Sugita, Tsuyoshi; Ueda, Yuki; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Hirayama, Naoki*

no journal, , 

In this study, the effect of the perfluoroalkyl (Rf) chain length of the ionic liquid (IL) anion on the extraction of trivalent lanthanoid ions (Ln(III) = La, Nd, Eu, Dy, Lu) using 2-thenoyltrifluoroacetone was investigated. Four 1-butyl-3-methylimidazolium bis(perfluoroalkanesulfonyl)imides with different Rf chain length (n = 1-4) were synthesized and used as the extraction solvent. There was no significant difference in the extractability among ILs. The extracted species of each Ln(III) in these IL systems were investigated based on the slope of the plots of the logarithmic distribution ratio of Ln(III) as a function of aqueous phase pH. It was revealed that the extracted complex depends on even or odd number of the Rf chain length n.

Oral presentation

Extraction of trivalent lanthanoids into ionic liquids having different side chain lengths in anions

Eguchi, Ayano; Okamura, Hiroyuki; Sugita, Tsuyoshi; Ueda, Yuki; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Hirayama, Naoki*

no journal, , 

In this study, the effect of the perfluoroalkyl (Rf) chain length of the ionic liquid (IL) anion on the IL chelate extraction was investigated. Four 1-butyl-3-methylimidazolium bis(perfluoroalkanesulfonyl)imides with different Rf chain length (n = 1 - 4) were synthesized and used as extraction solvents. Herein, the extraction of trivalent lanthanoids (Ln(III) = La, Nd, Eu, Dy and Lu) with an extractant, 2-thenoyltrifluoroacetone, was studied. It was revealed that the extracted complex depends on even or odd number of the Rf chain length n.

Oral presentation

Odd-even effect of ionic liquid anion perfluoroalkyl chain length on ionic liquid chelate extraction of trivalent lanthanoids

Eguchi, Ayano; Okamura, Hiroyuki; Sugita, Tsuyoshi; Ueda, Yuki; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Hirayama, Naoki*

no journal, , 

In this study, the effect of the perfluoroalkyl (Rf) chain length of the ionic liquid (IL) anion on the IL chelate extraction of trivalent lanthanoids using 2-thenoyltrifluoroacetone was investigated. Four 1-butyl-3-methylimidazolium bis(perfluoroalkanesulfonyl)imides with different Rf chain length (n = 1-4) were synthesized and used as extraction solvents. The extracted species differed depending on odd-even number of the Rf chain length n, and it was found that the Rf chain length of IL anion has the odd-even effect on the extracted species. The fluorescence lifetime of the extracted Eu(III) complex was measured and the number of coordinating water of Eu(III) was determined. As a result, the Eu(III) complex did not have coordinating water. It was suggested that the Rf chain length of the IL anion does not affect the number of coordinating water of the extracted complex.

Oral presentation

Effect of side chain length in ionic liquid anion on extraction of trivalent lanthanoids

Eguchi, Ayano; Okamura, Hiroyuki; Sugita, Tsuyoshi; Ueda, Yuki; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Hirayama, Naoki*

no journal, , 

Physical and chemical properties of ionic liquids (ILs) can be tuned by changing the combination of an anion and a cation. In the solvent extraction of metal ions, it is well known that the structure and alkyl chain length of the IL cation have a great effect on the extractability. However, the structural effect of the IL anion on the extractability is hardly clarified. In this study, the effect of the side chain length of the IL anion on the IL chelate extraction of trivalent lanthanoids using 2-thenoyltrifluoroacetone was investigated. Four 1-butyl-3-methylimidazolium bis(perfluoroalkanesulfonyl)imides with different side chain lengths (n = 1-4) were synthesized and used as extraction solvents. When using ILs which side chain lengths n were even (n = 2, 4), the extracted species were different from those when using ILs that n were odd (n = 1, 3) and the IL having hexafluorophosphate anion. It was, therefore, implied that the extracted species can be controlled by the side chain length of the IL anion.

Oral presentation

Effect of side chain in ionic liquid anion on ionic liquid chelate extraction of trivalent lanthanoids

Eguchi, Ayano; Okamura, Hiroyuki; Sugita, Tsuyoshi; Ueda, Yuki; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Hirayama, Naoki*

no journal, , 

Physical and chemical properties of ionic liquids (ILs) can be tuned by changing the combination of an anion and a cation composing an IL. In the solvent extraction of metal ions, it is considered that IL anions affect extraction by the interaction IL anions and metal ions. However, the structural effect of the IL anions on extraction is hardly clarified. In this study, the effect of the side chain of the IL anions on the IL chelate extraction of trivalent lanthanoids using 2-thenoyltrifluoroacetone was investigated. Four 1-butyl-3-methylimidazolium bis(perfluoroalkanesulfonyl)imides with different carbon number of side chain n (n = 1-4) were synthesized and used as extraction solvents. When n was even, the extracted species were different from those when n was odd. This result was considered to be due to the different IL solvation effects on the extracted complexes depending on n. It was implied that the side chain in the IL anions was involved in the extraction mechanism by affecting solvation of extracted complexes.

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