Anionenunterstützte Selbstorganisation

Fyfe, Matthew C. T.; Glink, Peter T.; Menzer, Stephan; Stoddart, J. Fraser; White, Andrew J. P.; Williams, David J.

doi:10.1002/ange.19971091908

Cited by 54 publications

(75 citation statements)

References 30 publications

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“…[19] The interplanar separations between the inside bipyridinium unit and the inside and alongside 1,5-dioxynaphthalene ring systems range between 3.30 and 3.41 in the two crystallographically independent molecules. The interplanar separations between the pair of inside 1,5-dioxynaphthalene ring systems are essentially the same (7.19 and 7.22 ).…”

Section: Resultsmentioning

confidence: 99%

Self-Complementary [2]Catenanes and Their Related [3]Catenanes

et al. 2000

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Three [3]catenanes with cavities large enough to accommodate aromatic guests have been designed and synthesized (yields = 5-20 %) by means of kinetically controlled self-assembly processes. The X-ray structural analysis of one of three [3]catenanes confirmed the presence of a rectangular cavity (dimensions = 7 x 11 A) lined by pi-electron-rich recognition sites and hydrogen-bond acceptor groups. In spite of their apparently ideal recognition features, none of these [3]catenanes bind guests incorporating a pi-electron-deficient bipyridinium unit. However, the template-directed syntheses of the [3]catenanes also produce, in yields of 2-23%, [2]catenanes incorporating a 1,5-dioxynaphtho[38]crown-10 interlocked with a bipyridinium-based tetracationic cyclophane. The X-ray structural analyses of two of these [2]catenanes revealed that a combination of [pi...pi] and [C-H...pi] interactions is responsible for the formation of supramolecular homodimers in the solid state. 1H NMR spectroscopic investigations of the four [2]catenanes demonstrated that supramolecular homodimers are also formed (Ka= 17-31M(-1), T= 185 K) in (CD3)2CO solutions. Dynamic 1H NMR spectroscopy revealed that the 1,5-dioxynaphtho[38]crown-10 and tetracationic cyclophane components in the four [2]catenanes and in the three [3]catenanes circumrotate (deltaGc(not equal to) = 9-14 kcal mol(-1)) through each other's cavity in (CD3)2CO. Similarly, the 1,5-dioxynaphthalene and the bipyridinium ring systems rotate (deltaGc(not equal to) =10-14 kcal mol(-1)) about their [O...O] and [N...N] axes, respectively, in solution.

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Section: Resultsmentioning

confidence: 99%

Self-Complementary [2]Catenanes and Their Related [3]Catenanes

et al. 2000

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“…[14] Chemical-induced shifts (CIS) in the solution 1 H NMR spectra were calculated by comparison with the resonances in dichloromethane of the uncomplexed acylated molecular threads (these are only poorly soluble in the acetonitrile and acetone used to record the NMR spectra of the rotaxanes). It has been established that the resonances of the protons of the nonacylated threads do not vary significantly in solvents such as dichloromethane and acetonitrile.…”

Section: H Nmr Spectroscopymentioning

confidence: 99%

Pseudorotaxanes and Rotaxanes Incorporating Cycloheptatrienyl Stations − Synthesis and Co-Conformation

et al. 2001

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“…[18] Thus, the present example represents the first case of encapsulation of a polyatomic anion by a helicate and only the second crystallographically characterized example of encapsulation of a hexafluorophosphate anion by any species. [19] Although PF À 6 ions normally act as noncoordinating anions, [20] the encapsulated anion within the cage 4 makes weak contacts with the palladium centers [Pd1 ± F11 2.789(5); Pd2 ± F12 2.911(5) ], as indicated by the dashed lines in Figure 1. The four remaining fluorine atoms reside in the spaces between the faces of the four benzene rings.…”

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confidence: 99%