Search results for "Rotaxane"
showing 10 items of 41 documents
Directional Shuttling of a Stimuli-Responsive Cone-Like Macrocycle on a Single-State Symmetric Dumbbell Axle
2018
Rotaxane-based molecular shuttles are often operated using low-symmetry axles and changing the states of the binding stations. A molecular shuttle capable of directional shuttling of an acid-responsive cone-like macrocycle on a single-state symmetric dumbbell axle is now presented. The axle contains three binding stations: one symmetric di(quaternary ammonium) station and two nonsymmetric phenyl triazole stations arranged in opposite orientations. Upon addition of an acid, the protonated macrocycle shuttles from the di(quaternary ammonium) station to the phenyl triazole binding station closer to its butyl groups. This directional shuttling presumably originates from charge repulsion and an …
Photoinduced Electron Transfer in Multiporphyrinic Interlocked Structures: The Effect of Copper(I) Coordination in the Central Site
2004
Photoinduced processes have been determined in a [2]catenane containing a zinc(II) porphyrin, a gold(III) porphyrin, and two free phenanthroline binding sites, Zn-Au(+), and in the corresponding copper(I) phenanthroline complex, Zn-Cu(+)-Au(+). In acetonitrile solution Zn-Au(+) is present in two different conformations: an extended one, L, which accounts for 40 % of the total, and a compact one, S. In the L conformation, the electron transfer from the excited state of the Zn porphyrin to the gold-porphyrin unit (k = 1.3x10(9) s(-1)) is followed by a slow recombination (k = 8.3x10(7) s(-1)) to the ground state. The processes in the S conformation cannot be clearly resolved but a charge-separ…
CCDC 781080: Experimental Crystal Structure Determination
2011
Related Article: J.-P.Collin, S.Durot, M.Keller, J.-S.Sauvage, Y.Trolez, M.Cetina, K.Rissanen|2011|Chem.-Eur.J.|17|947|doi:10.1002/chem.201002220
CCDC 706838: Experimental Crystal Structure Determination
2009
Related Article: J.Frey, C.Tock, J.-P.Collins, V.Heitz, J.-P.Sauvage, K.Rissanen|2008|J.Am.Chem.Soc.|130|11013|doi:10.1021/ja801924y
CCDC 100241: Experimental Crystal Structure Determination
1997
Related Article: P.N.W.Baxter, H.Sleiman, J.-M.Lehn, K.Rissanen|1997|Angew.Chem.,Int.Ed.|36|1294|doi:10.1002/anie.199712941
CCDC 1575263: Experimental Crystal Structure Determination
2018
Related Article: Yan-Long Ma, Hua Ke, Arto Valkonen, Kari Rissanen, Wei Jiang|2018|Angew.Chem.,Int.Ed.|57|709|doi:10.1002/anie.201711077
CCDC 1826426: Experimental Crystal Structure Determination
2018
Related Article: Jie‐Shun Cui, Qian‐Kai Ba, Hua Ke, Arto Valkonen, Kari Rissanen, Wei Jiang|2018|Angew.Chem.,Int.Ed.|57|7809|doi:10.1002/anie.201803349
CCDC 733684: Experimental Crystal Structure Determination
2010
Related Article: J.-P.Collin, J.-P.Sauvage, Y.Trolez, K.Rissanen|2009|New J.Chem.|33|2148|doi:10.1039/b9nj00278b
CCDC 1575262: Experimental Crystal Structure Determination
2018
Related Article: Yan-Long Ma, Hua Ke, Arto Valkonen, Kari Rissanen, Wei Jiang|2018|Angew.Chem.,Int.Ed.|57|709|doi:10.1002/anie.201711077
Dual-stimuli pseudorotaxane switches under kinetic control
2021
A series of dumbbell-shaped sec-ammonium salts with bulky (pseudo)stoppers (‘speed bumps’) were tested for their ability to form pseudorotaxanes with a redox-switchable, tetrathiafulvalene (TTF)-decorated [24]crown-8 ether. Depending on the size of the pseudostoppers, fast (less than ten minutes), slow (hours to days) and very slow (no pseudorotaxanes observed) threading has been observed. NMR spectroscopy as well as tandem mass spectrometry indicate the formation of non-threaded face-to-face complexes prior to pseudorotaxanes formation. Both isomers can be distinguished by their substantially different stability in collision-induced dissociation (CID) experiments. Two external stimuli affe…