"Majority rules" operative in chiral columnar stacks of C3-symmetrical molecules

J.A.M. Gestel, van, A.R.A. Palmans, B. Titulaer, J.A.J.M. Vekemans, E.W. Meijer

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C3-symmetrical disks 1, preorganized by acylated 2,2'-bipyridine-3,3'-diamine moieties and decorated with nine identical chiral, lipophilic tails, aggregate into a dynamic helix in apolar solvents. The aggregates, previously shown to be governed by the "sergeants-and-soldiers" principle when mixed with achiral analogues, are now also revealed to obey the "majority-rules" effect, a phenomenon not earlier observed in nonpolymers. Our experimental circular dichroism data can be accurately described with a recently developed theory. A fit of the theory to the experimental results shows that the mismatch penalty, i.e., the free energy of a monomer present in a helix of its nonpreferred screw sense (0.94 kJ/mol), is about 8 times lower than the penalty for a helix reversal (7.8 kJ/mol). This corresponds well to our vision of the supramolecular architecture of the disks.
Original languageEnglish
Pages (from-to)5490-5494
JournalJournal of the American Chemical Society
Issue number15
Publication statusPublished - 2005


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