Journal Article Isolation of the simplest hydrated acid

Zhang, Rui  ,  Murata, Michihisa  ,  Wakamiya, Atsushi  ,  Shimoaka, Takafumi  ,  Hasegawa, Takeshi  ,  Murata, Yasujiro

3 ( 4 ) 2017-04-21 , American Association for the Advancement of Science (AAAS)
一個の水分子により水和されたフッ化水素の単離に成功--水素結合を利用した電子デバイス材料の開発に期待--. 京都大学プレスリリース. 2017-04-24.
Dissociation of an acid molecule in aqueous media is one of the most fundamental solvation processes but its details remain poorly understood at the distinct molecular level. Conducting high-pressure treatments of an open-cage fullerene C70 derivative with hydrogen fluoride (HF) in the presence of H2O, we achieved an unprecedented encapsulation of H2O·HF and H2O. Restoration of the opening yielded the endohedral C70s, that is, (H2O·HF)@C70, H2O@C70, and HF@C70 in macroscopic scales. Putting an H2O·HF complex into the fullerene cage was a crucial step, and it would proceed by the synergistic effects of “pushing from outside” and “pulling from inside.” The structure of the H2O·HF was unambiguously determined by single crystal x-ray diffraction analysis. The nuclear magnetic resonance measurements revealed the formation of a hydrogen bond between the H2O and HF molecules without proton transfer even at 140°C.

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