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  4. Kinetic versus thermodynamic control during the formation of [2]rotaxanes by a dynamic template-directed clipping process
 
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2003
Journal Article
Titel

Kinetic versus thermodynamic control during the formation of [2]rotaxanes by a dynamic template-directed clipping process

Abstract
A template-directed dynamic clipping procedure has generated a library of nine [2]rotaxanes that have been formed from three dialkylammonium salts - acting as the dumbbell-shaped components-and three dynamic, imino bond-containing, [24]crown-8-like macrocycles - acting as the ring-shaped components - which are themselves assembled from three dialdehydes and one diamine. The rates of formation of these [2]rotaxanes differ dramatically, from minutes to days depending on the choice of dialkylammonium ion and dialdehyde, as do their thermodynamic stabilities. Generally, [2]rotaxanes formed by using 2,6-diformylpyridine as the dialdehyde component, or bis(3,5-bis(trifluoromethyl)benzyl)ammonium hexafluorophosphate as the dumbbell-shaped component, assembled the most rapidly. Those rotaxanes containing this particular electron-deficient dumbbell-shaped unit, or 2,5-diformylfuran units in the macroring, were the most stable thermodynamically. The relative thermodynamic stabili ties of all nine of the [2]rotaxanes were determined by competition experiments that were monitored by 1H NMR spectroscopy.
Author(s)
Horn, M.
Ihringer, J.
Glink, P.T.
Stoddart, J.F.
Zeitschrift
Chemistry. A European journal
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DOI
10.1002/chem.200204479
Language
English
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Fraunhofer-Institut für Angewandte Polymerforschung IAP
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