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4644252657
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note
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Final products were purified by chromatography at least three times on TLC or radial chromatography prior to NMR studies. The impurities can be characterized as such and not as being other conformations/aggregates of the oligomers because: (i) TLC reveals their presence; (ii) the line shape of their signals remains sharp at any temperature even when the rest of the spectrum broadens due to coalescence phenomena; (iii) when the concentration is varied, the proportions of single and double helices varies but the quantity of 'impurity' is proportional to neither of them: it remains proportional to the total concentration of single and double helices.
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41
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4644299877
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note
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The surface involved in π-π stacking in a double helical dimer is similar to that involved in two stacked single helical monomers. It differs from the surface involved in π-π stacking in two dissociated monomers by twice the cross-section of the helix.
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42
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4644288607
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note
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Crystal structures show that pyridine rings are sandwiched between amide functions in the single helices, whereas they are sandwiched between other pyridine rings in the double helices, see Ref. 19.
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