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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Nitrogen inversion ： ウィキペディア英語版 Nitrogen inversion In chemistry, nitrogen inversion is the interconversion of the chirality of a nitrogen compound with a trigonal pyramidal geometry, such as ammonia, whereby the molecule "turns inside out".〔Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.〕 ==Energy barrier considerations== The ammonia interconversion is rapid at room temperature. Two factors contribute to the rapidity of the inversion: a low energy barrier (24.2 kJ/mol) and a narrow width of the barrier itself, which allows for frequent quantum tunnelling (see below). In contrast, phosphine (PH3) inverts very slowly at room temperature (energy barrier: 132 kJ/mol).〔Kölmel, C.; Ochsenfeld, C.; Ahlrichs, R. An ab initio investigation of structure and inversion barrier of triisopropylamine and related amines and phosphines. ''Theor. Chim. Acta.'' 1991, ''82'', 271–284. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nitrogen inversion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.