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Oral presentation

Electrons in ionic liquids observed by positrons

Hirade, Tetsuya

no journal, , 

Ionic liquids has many remarkable properties. According to recent research works, free electrons can diffuse in ionic liquids. The free electrons are investigated by a reaction of free electrons and positrons, i.e. positronium formation. An anomalous long lifetime of para-positronium was observed. Age-momentum correlation measuremnt is also performed and the results is indicating that this anomalous long lifetime is not due to simple para-positronium component. These results are saying that free electrons can diffuse for long time.

Oral presentation

Liquid-liquid extraction of lanthanides into ionic liquids with a multidentate ligand

Shimojo, Kojiro; Naganawa, Hirochika; Kubota, Fukiko*; Yaita, Tsuyoshi; Suzuki, Shinichi; Goto, Masahiro*

no journal, , 

The extraction behavior of lanthanides from aqueous solutions into ionic liquids (ILs) and the stripping test have been investigated with N, N, N', N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) as a ligand. TPEN in ILs shows the extremely high extraction performance for lanthanides compared to that in chloroform. The stripping of lanthanides from ILs into a receiving phase is successfully achieved under acidic conditions. Furthermore, the leaching of TPEN from ILs into the receiving phase is negligible small, although almost all TPEN molecules in chloroform readily leach.

Oral presentation

Anionic uranyl thiocyanate complex forming room temperature ionic liquids

Aoyagi, Noboru; Shimojo, Kojiro; Nagaishi, Ryuji; Toraishi, Takashi; Suzuki, Shinichi; Kimura, Takaumi

no journal, , 

Metal-containing ionic liquids such as [C$$_{n}$$mim][AlCl$$_{4}$$] and [C$$_{n}$$mim][FeCl$$_{4}$$], have been received much attention in synthetic, catalytic, electrochemical, magnetic application and so on. In the present study, we report the syntheses, and spectral properties to discuss the coordination geometries of uranyl isothiocyanate since no complex is known for ${it m}$ $$>$$ 3 in any solvents (${it m}$ is the number of coordinated ligands). All materials, [C$$_{4}$$mim]$$_{x}$$[U$$^{VI}$$O$$_{2}$$(NCS)$$_{x+2}$$(H$$_{2}$$O)$$_{3-x}$$](${it x}$ = 1 - 3), exhibited brilliant colors: wine red - crimson - orange. Also, the first thermochromism of actinide compounds were found.

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