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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 Four-center two-electron bond ： ウィキペディア英語版 Four-center two-electron bond A four-center two-electron bond is a type of chemical bond in which four atoms share two electrons in bonding, with a net bond order of ½. This type of bonding differs from the usual covalent bond, which involves two atoms sharing two electrons (2c-2e bonding). Four-center two-electron bonding is postulated in certain cluster compounds. For instance, the borane B anion, is a B octahedron with an additional proton attached to one of the triangular faces. As a result, the octahedron is distorted and a BBBH rhomboid ring can be identified in which this 4c-2e bonding takes place. This type of bonding is associated with electron deficient rhomboid rings in general and is a relatively new research field, fitting in with the already well established three-center two-electron bond. An example of a purely organic compound with four-center two-electron bonding is the adamantyl dication.〔Matthias Bremer, Paul von Ragué Schleyer, Karl Schötz, Michael Kausch, Michael Schindler Four-Center Two-Electron Bonding in a Tetrahedral Topology. Experimental Realization of Three-Dimensional Homoaromaticity in the 1,3-Dehydro-5,7-adamantanediyl Dication. ''Angewandte Chemie International Edition in English'' 1987, ''26'', 761-763. 〕 The bond joins the four bridgehead atoms in a tetrahedral geometry. Tetracyanoethylene forms a dianionic dimer in which the two alkenes are joined face-to-face by a rectangular four-center two-electron bond. Various solid salts of this dianion have been studied to determine bond strengths and vibrational spectroscopic details. ==References== 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「Four-center two-electron bond」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.