Fig. 1: Schematic representation of supramolecular rosette-intermediated hierarchical assembly of homochiral double-helix.
From: Supramolecular rosette intermediated homochiral double helix
a The chemical structures of (R, R)-NU and (S, S)-NU enantiomers. b DFT-optimized structure of (R, R)-NU showed opposite urea directions using the benzene ring as a reference plane. c DFT-optimized electrostatic potential map of (R, R)-NU. Scale bar: arbitrary unit (arb. units). d The chemical structure of a rosette held together by intermolecular (black dashed lines) and intramolecular (red dashed lines) hydrogen bonds. R = ethyl naphthalene. e Schematic illustration of rosette stacking and intertwining into double-helix nanostructures, which adsorb achiral CBS dye to perform chiral light-harvesting, leading to circularly polarized luminescence from CBS. CPL: circularly polarized luminescence. CBS: 2,2′-([1,1′-biphenyl]-4,4′-diyldi-2,1-ethenediyl)bis-benzenesulfonic acid disodium salt. D/A ratios: donor/acceptor ratios. ΦET: excitation energy transfer efficiency.
