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Temperature dependent absorption spectra of Br$$^{-}$$, Br$$_{2}$$$$^{.-}$$, and Br$$_{3}$$$$^{-}$$ in aqueous solutions

水溶液中のBr$$^{-}$$, Br$$_{2}$$$$^{.-}$$とBr$$_{3}$$$$^{-}$$の吸収スペクトルの温度依存性

Lin, M.; Archirel, P.*; Van-Oanh, N. T.*; 室屋 裕佐*; Fu, H.*; Yan, Y.*; 永石 隆二 ; 熊谷 友多   ; 勝村 庸介*; Mostafavi, M.*

Lin, M.; Archirel, P.*; Van-Oanh, N. T.*; Muroya, Yusa*; Fu, H.*; Yan, Y.*; Nagaishi, Ryuji; Kumagai, Yuta; Katsumura, Yosuke*; Mostafavi, M.*

パルスラジオリシス法により水溶液中のBr$$_{2}$$$$^{.-}$$とBr$$_{3}$$$$^{-}$$の吸収スペクトルの温度依存性を室温から380$$^{circ}$$Cまでの温度領域で測定した。Br$$_{2}$$$$^{.-}$$とBr$$_{3}$$$$^{-}$$の吸収スペクトルの温度依存性は小さく、これらの遷移は結合状態間のものであることがわかった。また、Br$$^{-}$$の水和構造について20と300$$^{circ}$$C、25MPaのもとで古典力学の計算を行った結果、温度によらず第一水和圏の水分子は陰イオンに強く結合していることがわかった。時間依存密度汎関数法によって二つの温度でのBr$$^{-}$$の水和イオンの吸収スペクトルを計算して、実験結果と比較した。

The absorption spectra of Br$$_{2}$$$$^{.-}$$ and Br$$_{3}$$$$^{-}$$ in aqueous solutions are investigated by pulse radiolysis techniques from room temperature to 380 and 350$$^{circ}$$C, respectively. The weak temperature effect on the absorption spectra of Br$$_{2}$$$$^{.-}$$ and Br$$_{3}$$$$^{-}$$ is because in these two systems, the transition occurs between two valence states. We performed classical dynamics of hydrated Br$$^{-}$$ system at 20 and 300$$^{circ}$$C under pressure of 25 MPa. This shows that the first water shell is strongly bound to the anion whatever the temperature. The first two water shells form a cavity of a roughly spherical shape around the anion. By TDDFT method, we calculated the absorption spectra of hydrated Br$$^{-}$$ at two temperatures and we compared the results with the experimental data.

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パーセンタイル:44.71

分野:Chemistry, Physical

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