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Molekulare Bremse: Die Wechselwirkungen zwischen Stab und Makrocyclus eines [2]Rotaxans können quasi stufenlos eingestellt werden, indem man H‐Brücken bildende Lösungsmittelmoleküle einzeln zu einem isolierten [2]Rotaxan‐Molekül gibt. So lassen sich gezielt Konformationsänderungen herbeiführen, die den Stab vom Makrocyclus freigeben – was dem kontrollierten Lösen der molekularen Bremse entspricht.
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