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77956813169
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The dynamic data were estimated by using the coalescence method; see
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The dynamic data were estimated by using the coalescence method; see: I. O. Sutherland, Annu. Rep. NMR Spcctrosc. 1971, 4, 71-235.
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Sutherland, I.O.1
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53849115681
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It has been demonstrated that the shuttling process could be initiated by the addition of a polar solvent that disrupts the hydrogenbonding interactions between the macrocycle and the dumbbell component of a glycylglycine rolaxane in a less-polar solvent, but this procedure seems to be irreversible; see: D. A. Leigh, A. Murphy, M. J. Smart, A. M. Z. Slawin. Angew. Chem. 1997, 109, 752-756;
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It has been demonstrated that the shuttling process could be initiated by the addition of a polar solvent that disrupts the hydrogenbonding interactions between the macrocycle and the dumbbell component of a glycylglycine rolaxane in a less-polar solvent, but this procedure seems to be irreversible; see: D. A. Leigh, A. Murphy, M. J. Smart, A. M. Z. Slawin. Angew. Chem. 1997, 109, 752-756;
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17
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0030691058
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there are several examples of methods to covalently block the movement of a macrocycle along a rotaxane's thread;
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Lane, A.S.1
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18844455258
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see: b
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see: b) X S. Hannam, S. M. Lacy, D. A. Leigh, C. G. Saiz, A. M. Z. Slawin, S. G. Stitchell. Angew. Chem. 2004, 116, 3322-3326;
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53849107127
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1 ions takes more than 10 min to perform; see reference [6].
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1 ions takes more than 10 min to perform; see reference [6].
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26
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33645030407
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a) P.-N. Cheng, P.-Y. Huang. W.-S. Li, S.-H. Ueng. W.-C. Hung. Y.-H. Liu. C.-C. Lai, S.-M. Peng, I. Chao, S.-H. Chiu, J. Org. Chem. 2006, 71, 2373-2375;
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Chiu, S.-H.10
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b) P.-N. Cheng, C.-F. Lin, Y.-H. Liu, C.-C. Lai, S.-M. Peng, S.-H. Chiu, Org. Lett. 2006, 8, 435-438.
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53849120516
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The relationship ΔGc≠, RTcln (kch/kRTc, in which R, h, and kB correspond to the gas, Planck, and Boltzmann constants, respectively. was used to obtain values for the free energy of activation for shuttling (ΔG c≠) at the coalescence temperature Tc, By using the tert-butyl groups as probe protons, the values of Δv, Tc, and kc were determined to be 44.8 Hz, 264 K. and 100 s 1, respectively, which corresponds to a ΔGc ≠ value of 13.0 kcal mol 1 and is quite close to the value we obtained by using proton H1, as the probe
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1 and is quite close to the value we obtained by using proton H1, as the probe.
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31
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53849094740
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Crystal data for 3·H2O·2PF6: [C 74H94O7N4][PF6] 2; Mt= 1441.47: triclinic; space group P1̄; a, 12.1307(2, b, 12.8642(1, c, 27.3374(4) Å V, 3867.49(9) Å3; ρcated, 1.238 g cm 3, μ(MoKα, 0.137 mm-1; T=295(2) K; colorless prisms: 13556 independent measured reflections; F2 refinement; R 1, 0.0988, wR2, 0.2862
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2 = 0.2862.
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32
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35248842370
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-1 for the complexation between BPX26C6 and 2,2′-bipyridinium bis(hexafluorophosphate) in the same solvent; see: N.-C. Chen, P.-Y. Huang, C.-C. Lai, Y.-H. Liu, S.-M. Peng, S.-H. Chiu, Chem. Commun. 2007, 4122-4124.
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-1 for the complexation between BPX26C6 and 2,2′-bipyridinium bis(hexafluorophosphate) in the same solvent; see: N.-C. Chen, P.-Y. Huang, C.-C. Lai, Y.-H. Liu, S.-M. Peng, S.-H. Chiu, Chem. Commun. 2007, 4122-4124.
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33
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0035822010
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Several nondegenerate [2]rotaxanes that behave as acid/base-conlrolled molecular switches are known; see: a J. W. Lee, K. Kim, K. Kim. Chem. Commun. 2001, 1042-1043;
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Several nondegenerate [2]rotaxanes that behave as acid/base-conlrolled molecular switches are known; see: a) J. W. Lee, K. Kim, K. Kim. Chem. Commun. 2001, 1042-1043;
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34
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0037184773
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b) A. M. Elizarov, S.-H. Chiu, J.F. Stoddart, J. Org. Chem. 2002, 67, 9175-9181;
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Elizarov, A.M.1
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35
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c) J. D. Badjic, C. M. Ronconi, J. F. Stoddart, V. Balzani, S. Silvi, A. Credi, J. Am. Chem. Soc. 2006, 128, 1489-1499.
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Badjic, J.D.1
Ronconi, C.M.2
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Silvi, S.5
Credi, A.6
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36
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53849128129
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6 does not dimerize under these conditions.
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6 does not dimerize under these conditions.
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37
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12444311699
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2+ ions by TPEN, see: a E. Kawabata, K. Kikuchi, Y. Urano, H. Kojima, A. Odani, T Nagano, J. Am. Chem. Soc. 2005, 127, 818-819;
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2+ ions by TPEN, see: a) E. Kawabata, K. Kikuchi, Y. Urano, H. Kojima, A. Odani, T Nagano, J. Am. Chem. Soc. 2005, 127, 818-819;
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30344462699
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b) C. A. Blindauer, M. T. Razi, S. Parsons, P. J. Sadler, Polyhedron 2006, 25, 513-520.
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(2006)
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Blindauer, C.A.1
Razi, M.T.2
Parsons, S.3
Sadler, P.J.4
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39
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53849121226
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The use of metal coordination to block the passage of the macrocycle in a rotaxane has been reported previously; see: D. A. Leigh, P. J. Lusby, A. M. Z. Slawin, D. B. Walker, Angew. Chem. 2005, 117, 4633-4640;
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The use of metal coordination to block the passage of the macrocycle in a rotaxane has been reported previously; see: D. A. Leigh, P. J. Lusby, A. M. Z. Slawin, D. B. Walker, Angew. Chem. 2005, 117, 4633-4640;
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40
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