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The disadvantage of flexible bonds in supramolecular host-guest complexes is much smaller than usually assumed. In the association of dicarboxlic acids with diamides (shown on the right), freely rotatable single bonds have only a minor disadvantageous influence on the free energy of complexation ΔG . From the linear correlation between ΔG and the number of single bonds n, a decrease in the free energy of complexation of only 1.3 kJ mol per single bond was determined.

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