Abstract:Die Hantel rauf und runter: Der Cyclodextrin‐Makrocyclus bewegt sich bei Photoisomerisierung des Stilben‐Rotaxans in genau eine Richtung (siehe Schema). Mit diesem Verhalten ermöglichen die beschriebenen und ähnliche Rotaxane Rückschlüsse auf Mechanismen des Hin‐und‐Herbewegens bei molekularen Maschinen.
“…Trans-aminostilbenes are a class of p-donor-acceptor (D-A) systems that have been investigated as fluorescent probes [1][2][3][4][5][6], cell imaging dyes [7][8][9], and the active materials in a variety of optoelectronic devices such as organic light-emitting diodes [10,11], dye-sensitized solar cells [12][13][14], nonlinear optics [15][16][17][18][19][20], and molecular switches [21,22]. These applications are all associated with the electronically excited states, in which the lowest singlet excited state (S 1 ) possesses a significant degree of charge separation as a result of intramolecular charge-transfer (ICT) from the amino to the stilbene moiety upon photoexcitation.…”
“…Trans-aminostilbenes are a class of p-donor-acceptor (D-A) systems that have been investigated as fluorescent probes [1][2][3][4][5][6], cell imaging dyes [7][8][9], and the active materials in a variety of optoelectronic devices such as organic light-emitting diodes [10,11], dye-sensitized solar cells [12][13][14], nonlinear optics [15][16][17][18][19][20], and molecular switches [21,22]. These applications are all associated with the electronically excited states, in which the lowest singlet excited state (S 1 ) possesses a significant degree of charge separation as a result of intramolecular charge-transfer (ICT) from the amino to the stilbene moiety upon photoexcitation.…”
“…The molecular components are not covalently linked and bulky stoppers bound to the ends of the linear component prevent dissociation of the complex. Because the macrocyles are not covalently linked to the chain, rotaxanes can be used as molecular motors [1][2][3][4] or molecular switches [5][6][7][8][9][10][11][12].…”
Section: Introductionmentioning
confidence: 99%
“…Cyclodextrins (CDs) are macrocyclic structures used to synthetise rotaxanes [1,2,7,9,10,[12][13][14][15]. CDs are well known cyclic oligosaccharides formed by 6, 7, or 8 a-D-glucose named a-, b-, or g-CD, respectively [16].…”
“…[15][16][17][18][19][20][21][22] Most of these previously reported systems were two-geometry compounds, which were able to switch between a stable five-coordinate copper(II) complex where the copper(II) center is coordinated to a bidentate and a tridentate chelate and a second form, which is a four-coordinate copper(I) complex. [17b] Molecular "shuttles" [23][24][25][26][27][28][29][30] represent the archetype of molecular machines and, equally importantly, they are often used in the fabrication of real devices. A rare example of a three-geometry system was reported in 1996, and was based on a [2]catenane that consisted of two identical rings, each ring incorporating two different chelating units (a bi-and a tridentate ligand).…”
mentioning
confidence: 99%
“…The copper center could thus be four-, five-, or six-coordinate. [17b] Molecular "shuttles" [23][24][25][26][27][28][29][30] represent the archetype of molecular machines and, equally importantly, they are often used in the fabrication of real devices. [9] The shuttle-like [2]rotaxanes reported to date are two-station systems.…”
Hin und her: Der bewegliche Ring eines durch Kupfer komplexierten [2]Rotaxans enthält eine endocyclische zweizähnige Bindestelle. Auf der Rotaxanachse befinden sich drei unterschiedliche chelatisierende Stationen (siehe Bild), wobei die äußeren beiden etwa 23 Å auseinander liegen. Die Bewegung des Rings wird durch Oxidation oder Reduktion des Kupferzentrums ausgelöst und ist so schnell wie in einem ähnlichen Rotaxan mit zwei Stationen in 10 Å Abstand.
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