| 翻訳と辞書 |
Carcerand
A carcerand is a host molecule that completely entraps its guest so that it will not escape even at high temperatures.〔''Shell closure of two cavitands forms carcerand complexes with components of the medium as permanent guests'' Donald J. Cram, Stefan Karbach, Young Hwan Kim, Lubomir Baczynskyj, Gregory W. KallemeynJ. Am. Chem. Soc.; 1985; 107(8); 2575-2576. (Abstract )〕 This type of molecule was first described by Donald J. Cram in 1985 and is derived from the Latin ''carcer'', or prison. The complexes formed by a carcerand with permanently imprisoned guests are called carceplexes.
In contrast hemicarcerands allow guests to enter and exit the cavity at high temperatures but will form stable complexes at ambient temperatures.〔''Recent Highlights in Hemicarcerand Chemistry'' Ralf Warmuth and Juyoung Yoon, Accounts of Chemical Research Volume 4, Issue 2, Pages 95-105, ''2001''.〕 The complexes formed by a hemicarcerand and a guest are called hemicarceplexes.
==Reactivity of bound guests==
Cram described the interior of the container compound as the inner phase in which radically different reactivity was observed.〔''The Inner Phase of Molecular Container Compounds as a Novel Reaction Environment'' Ralf Warmuth Journal of Inclusion Phenomena and Macrocyclic Chemistry 37: 1–38, 2000.〕 He used a hemicarcerand to isolate highly unstable, antiaromatic cylobutadiene at room temperature. The hemicarcerand stabilizes guests within its cavity by preventing their reaction with other molecules.
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「Carcerand」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.
|
|