Diversity of interstrand π—π stacking motifs in the double helices of pyridinedicarboxamide oligomers |
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Authors: | Maurizot V Léger J-M Guionneau P Huc I |
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Institution: | (1) European Institute of Chemistry and Biology, 2 rue Robert Escarpit, 33607 Pessac Cedex, France;(2) Laboratory of Pharmacochemistry, Victor Segalen University of Bordeaux II, 146, Léo Saignat, 33076 Bordeaux, France;(3) Institute of Solid-State Chemistry, 87, av. Doctor Schweitzer, 33608 Pessac Cedex, France |
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Abstract: | Winding of oligoamide strands of 2,6-diaminopyridine and 2,6-pyridinedicarboxylic acid into molecular duplexes is illustrated by two new crystal structures of double helical dimers. The relative positions of the two strands within the double helices in these two structures are different; they also differ from the structures reported previously. Unlike the single helical structure of the monomeric strands, the double helical motif is not highly stable in the solid state. This implies that the interactions that lead to duplex formation are not directional. It suggests that the two strands have a significant motional freedom in the duplex. |
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Keywords: | conformational analysis helical structures hydrogen bonds stacking of aromatic fragments supramolecular chemistry |
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