Rotaxanes structure formula

Figure 13.4 Structure formulas of (a) the two-station rotaxane 14+ that behaves as a degenerate molecular shuttle and (b) its molecular components 2 and 34 + and model rotaxane 44 +.

Figure 13.6 Structure formulas of triply branched compound 5b+ and of its rotaxanes 6, 7b, and 8b. ...

Figure 13.9 Structure formula of rotaxane 9H3+ and representation of its operation as a pH controllable molecular shuttle.

Figure 13.26 Structure formula of rotaxane 294+ and the electrochemically induced shuttling of the cyclophane along the dumbbell-shaped component (CH3CN, 298 K).

Figure 13.29 Structure formulas of rotaxane 316+, its dumbbell-shaped component 326+,...

Figure 6.8 Structural formula of the rotaxane 96+ and schematic representation of the intramolecular (below left) and sacrificial (below right) mechanisms for the photoinduced shuttling movement of macrocycle between the two stations A1 and A2.

Figure 17.13 Structure formulas of V-shaped rotaxanes 144+ and 154+, and bistable rotaxanes 164+ and 174+, used to construct switchable electronic junctions for memory and logic function purposes.114 118 119 (Adapted with permission from V. Balzani et al., ChemPhysChem 2008, 9, 202-220. Copyright Wiley-VCH Verlag GmbH Co. KGaA.)...

Fig. 31 Mechanical actuation of a gold-coated microcantilever by molecular muscles [227]. (a) Structural formula of a palindromic, bistable [3]rotaxane with gold-binding dithiolane groups attached to the cyclophanes. (b) Reversible bending up and down of a cantilever by actuation of a monolayer ( 8 billion molecules) of the rotaxanes on its surface. The gold surface bends when the rotaxanes contract under the influence of an electrochemical oxidation that causes the cyclophanes to shuttle inward from the periphery of the molecule, (c) Electrochemical cell (Ag/AgCl, Pt, and the cantilever are the reference, counter, and working electrodes, respectively) and combined AFM device used to measure the bending by detecting a laser beam reflected off of the cantilever s surface...

Fig. 34 Example of mechanized mesoporous silica nanoparticles (MSNPs). SEM (a) and TEM (b) images show the structure and morphology of the MSNP platform [238]. (c) Structural formula of the a-cyclodextrin-based snap-top rotaxane that blocks the pores of an enzyme-cleavable mechanized MSNP. The stopper is connected to the stalk (dumbbell) by an ester or an amide bond [254]. (d) Release profile of rhodamine B from the snap-top MSNP. The addition of an esterase enzyme cleaves the ester bond, releasing the stopper, a-cyclodextrin, and cargo from the nanoparticles, which is monitored by the fluorescence intensity of rhodamine B. Controls employing an amide bond snap-top or deactivated enzyme do not release significant amounts of cargo...

Fig. 16 Structural formula of rotaxane 126+ (top) and intramolecular working mechanism for the photochemically induced ring shuttling (bottom). Right Potential energy profile for each molecular structure illustrated on the left [75, 76], Steps 1-4 are described in the text...

If y 9, then the orbit S ((e, y)) e S lvt of the labeled molecular graph (e, y) is called a connected unlabeled molecular graph. Equivalence classes of connected labeled molecular graphs can be identified with constitutional formulas of chemical compounds. Exceptions are exotic compounds such as catenanes and rotaxanes, whose structural formulas correspond to disconnected graphs. These are not dealt with in this book. The notation is... 

Figure 36 Structural formula of the PET reaction-based photochemical-driven CBPQT-containing rotaxane. (Reproduced from Ref. 70.

Figure 19 Structural formula of the surface-bound photoswitchable rotaxane 31 and schematic representation of its shuttling...

Figure 27 (a) Structural formula of rotaxane 43 + and (b) schematic representation of the photochemically driven autonomous ring... 

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