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Report No.
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Optical properties of tetravalent uranium complexes in non-aqueous media

Aoyagi, Noboru  ; Watanabe, Masayuki  ; Kirishima, Akira*; Sato, Nobuaki*; Kimura, Takaumi 

Tetravalent uranium halides were studied to understand photo-physical behaviors under the unexplored condition such as in non-aqueous media at ambient condition or at a cryogenic temperature. The anhydrous uranium tetrahalides (synthesized) were added into a series of dry organic solvents or a hydrophilic ionic liquid to observe their UV-Vis-NIR absorption spectra and time-resolved luminescence spectra in detail. The lower energy bands of UX$$_{4}$$ (X = F, Br, and I) appearing in UV-Vis-NIR absorption spectra in dry 1,4-dioxane were assigned as the transition from the ground state manifold to higher multiples ranging from 6,000 to 12,000 cm$$^{-1}$$. In contrast, there is the spectral emerging for these absorption spectra in the IL at higher energy band around 12,000 to 18,000 cm$$^{-1}$$ with each peak broadened. These complexes exhibit white photoluminescence by UV-pulse excitation at $$lambda$$$$_{ex}$$ = 394 nm, with broad multiple peaks assigned. The fluorescence lifetimes for these are 12.8 ns (1,4-dioxane) and 18.6 ns (IL) in spite of the longer U-I separation than that of U-NCS. Chemical species and the coordination number of U$$^{rm IV}$$ in water, in organic solutions, and in an IL could be thoroughly different, resulting in a variety of spectra.

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