Art02_Miyamoto.indd

With a combination of a single anion-exchange column and mixed media of CH 3 COOH and other acids (HCl and/ or HNO 3 ), 50 ng each of U, Th, Pb, and the lanthanides were sequentially separated. The mixed media including CH 3 COOH were effective for the sequential separation. All of the elements were more than 95% recovered, and the decontamination factor was more than 100. Major elements in geological samples such as alkali metals, alkaline earth metals, and Fe were eliminated from the column. This separation technique reduces separation time and simplifies the complicated traditional processes without any special reagents or equipments. The technique has potential for use in pg (10 -12 g) level trace analysis

Thermochromic properties of low-melting ionic uranyl isothiocyanate complexes

Temperature-dependent yellow-to-red colour changes of uranyl thiocyanate complexes with 1-alkyl-3-methylimidazolium cations have been studied by different spectroscopic methods and this phenomenon is attributed to changes in the local environment of the uranyl ion, including the coordination number, as well as to cation-anion interactions.status: publishe

Photophysical Property of catena-Bis(thiocyanato)aurate(I) Complexes in Ionic Liquids

The photochemistry of a gold(I) thiocyanate complex has been investigated to determine the coordination structure in both the solid and liquid states. The coordination geometries of the supramolecular [Au(SCN)(2)](n) complex and the concomitant exciplex have mainly been analyzed by crystallographic analysis and X-ray absorption spectroscopy. The Au-S bond distance and Au...Au separation of the compound in the S-0 ground state and in the T1 phosphorescent excited state (lambda(ex) = 340 nm) were compared. Upon irradiation with UV light, the excimeric interactions were enhanced, resulting in a contraction of the Au-I...Au-I aurophilic distance by 0.0113(4) angstrom. A broad luminescence spectrum was observed for the one-dimensional chain suprastructure. The time-resolved luminescence spectra indicated the entity of several oligomeric species in the crude liquid without neutral solvent molecules. In addition, extended X-ray absorption fine structure spectroscopy exhibited a slight change in the nearest AuS distance due to the photoswitched transformation. The deformation of the (Au---Au)* exciplexes was not apparently promoted in the liquid state with the asymmetrical imidazoium cations having a nonlocal charge distribution in the present observation. This is plausibly due to a flexible molecular structure and a property in the liquid state. In conclusion, the photoexcited nature of the pseudo-one-dimensional complexes has emerged in controlling bond distances among the supramolecular networks.status: publishe

Thermochromic properties of low-melting ionic uranyl isothiocyanate complexes

Temperature-dependent yellow-to-red colour changes of uranyl thiocyanate complexes with 1-alkyl-3-methylimidazolium cations have been studied by different spectroscopic methods and this phenomenon is attributed to changes in the local environment of the uranyl ion, including the coordination number, as well as to cation-anion interactions