Published in

American Chemical Society, Journal of Organic Chemistry, 6(81), p. 2581-2588, 2016

DOI: 10.1021/acs.joc.6b00281

Links

Tools

Export citation

Search in Google Scholar

Supramolecular Gelation of Rigid Triangular Macrocycles Through Rings of Multiple C–H•••O Interactions Acting Cooperatively

This paper is available in a repository.
This paper is available in a repository.

Full text: Download

Green circle
Preprint: archiving allowed
  • Must obtain written permission from Editor
  • Must not violate ACS ethical Guidelines
Orange circle
Postprint: archiving restricted
  • Must obtain written permission from Editor
  • Must not violate ACS ethical Guidelines
Red circle
Published version: archiving forbidden
Data provided by SHERPA/RoMEO

Abstract

On mixing equimolar solutions of the enantiomeric naphthalenediimide-based highly rigid triangles R-delta and S-delta in ClCH2CH2Cl, the racemate rac-delta forms an organogel which is composed of interwoven fibers, resulting from the columnar stacking of the triangles in an alternating R-delta/S-delta fashion. Under identical conditions, the pure enantiomers do not form organogels. DFT Calculations reveal that the racemic (RS)-dimer is more stable than the (RR)-dimer as a result of the enantiomeric relationship between R-delta and S-delta allowing them to act as two complementary rings comprised of 12 [C–H...O] interactions with an unprecedented and uninterrupted circular ADDAADDAADDA.DAADDAADDAAD alignment of hydrogen bond donors (D) and acceptors (A), in contrast with the square-wave manner in which the (RR)-dimer forms a complementary, yet interrupted ADADAD.DADADA circular sequence of six longer [C–H...O] hydrogen bonds. It follows that gelation is favored by weak interactions acting cooperatively in rings under precise stereoelectronic control.