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70349903640
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See the Supporting Information for details of UV/Vis spectroscopic titration of 1a-1d with 4 in CHCl3 Figure S1-S5
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3 (Figure S1-S5).
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16
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78651189765
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a) J. Monod, J. Wyman, J.-P. Changeux, J. Mol. Biol. 1965, 12, 88-118;
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Monod, J.1
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33845594872
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We recently demonstrated that an unconventional enantioselective recognition system for 5R can be designed using an allosteric double-decker host molecule. Since the allosteric host is predisposed for memorized 5R (R state) but it is sterically biased for the unmemorized S enantiomer (T state, the host molecule can differentiate between two enantiomers with extremely high selectivity; that is, the host molecule binds the R enantiomer (n, 1.6 and K1, 1.3 × 103M-1) with low cooperativity whereas it binds the S enantiomer (n, 2.9 and K1, 5.0 M-1) with high cooperativity. This result implies that the original conformation of a host molecule exerts a strong effect on the cooperativity in the binding of guest molecules, see, T. Ikeda, O. Hirata, M. Takeuchi, S. Shinkai, J. Am. Chem. Soc. 2006, 128, 16008-16009
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-1) with high cooperativity. This result implies that the original conformation of a host molecule exerts a strong effect on the cooperativity in the binding of guest molecules, see : T. Ikeda, O. Hirata, M. Takeuchi, S. Shinkai, J. Am. Chem. Soc. 2006, 128, 16008-16009.
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19
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70349896406
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At this stage, it is unclear for us whether this weak interaction arises from π-π, CH-π, or van der Waals interaction, or the cooperative interaction between them. In addition, we cannot rule out the influence of the difference in the alkyl chain lengths between olefinic and non-olefinic receptors. It is more likely, however, that olefinic substituents, which include the differences in the lengths of alkyl chains and the presence or the absence of the chain branching, influence the allosteric behavior more than other possible factors arising from the functionalization of terminal olefins
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At this stage, it is unclear for us whether this weak interaction arises from π-π, CH-π, or van der Waals interaction, or the cooperative interaction between them. In addition, we cannot rule out the influence of the difference in the alkyl chain lengths between olefinic and non-olefinic receptors. It is more likely, however, that "olefinic substituents", which include the differences in the lengths of alkyl chains and the presence or the absence of the chain branching, influence the allosteric behavior more than other possible factors arising from the functionalization of terminal olefins.
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20
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0012358798
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M. Ayabe, A. Ikeda, Y. Kubo, M. Takeuchi, S. Shinkai, Angew. Chem. 2002, 114, 2914-2916;
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Ayabe, M.1
Ikeda, A.2
Kubo, Y.3
Takeuchi, M.4
Shinkai, S.5
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21
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0037008562
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Angew. Chem. Int. Ed. 2002, 41, 2790-2792.
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(2002)
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22
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0034562964
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M. Ikeda, M. Takeuchi, A. Sugasaki, A. Robertson, T. Imada, S. Shinkai, Supramol. Chem. 2000, 12, 321-345.
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Ikeda, M.1
Takeuchi, M.2
Sugasaki, A.3
Robertson, A.4
Imada, T.5
Shinkai, S.6
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70349935661
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The cooperative guest-binding process was analyzed according to the Hill equation and a nonlinear least-squares method. The Ktot values were obtained by the multiplication of each sequential binding constant or by the Hill equation for 2a with C60 and 3a with 5R, which showed the maximum cooperativity. The Gibbs free energy change (AG) was calculated by the equation: ΔG, RTlnKtot, where R and T are the gas constant and temperature, respectively
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tot, where R and T are the gas constant and temperature, respectively.
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24
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70349924308
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See the Supporting Information for details of UV/Vis spectroscopic titration of 2a-2b with 4 in CHCl3 Figures S6-S8
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3 (Figures S6-S8).
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25
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70349915098
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See the Supporting Information for details of UV/Vis spectroscopic titration of 2b with C60 in toluene Figures S9 and S10
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60 in toluene (Figures S9 and S10).
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26
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70349935687
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See the Supporting Information for details of circular dichroism spectroscopic titration of 3a-3b with 5R in CH2Cl 2/AcOEt, 30:1 v/v; Figures S11-S13
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2/AcOEt = 30:1 (v/v; Figures S11-S13).
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27
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70349926366
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Host molecules 1a-c show the higher effects on the energy difference in ΔG between olefinic and non-olefinic hosts compared to those of 2. This energy difference probably arises from the shorter distance between olefin substituents within lb and 1c, and/or to the less rotational freedom of 1 than that of 2; host molecules 1 have only one rotational axis within the structure whereas the receptors 2 have as many as three axes.
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Host molecules 1a-c show the higher effects on the energy difference in ΔG between olefinic and non-olefinic hosts compared to those of 2. This energy difference probably arises from the shorter distance between olefin substituents within lb and 1c, and/or to the less rotational freedom of 1 than that of 2; host molecules 1 have only one rotational axis within the structure whereas the receptors 2 have as many as three axes.
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0032558616
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M. Takeuchi, T. Imada, M. Ikeda, S. Shinkai, Tetrahedron Lett. 1998, 39, 7897-7900.
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(1998)
Tetrahedron Lett
, vol.39
, pp. 7897-7900
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Takeuchi, M.1
Imada, T.2
Ikeda, M.3
Shinkai, S.4
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