Fig. 2: Preparation and characterization the helical supramolecular polymer.
From: Helical supramolecular polymers with rationally designed binding sites for chiral guest recognition
a Solubility of 2S (left) and their salt 1∙2S (right) in dodecane (3.2 µmol/800 µL) at 298 K. b FT-IR spectra of 1∙2S in dodecane (4.0 mM) at 298 (solid curve) and 348 K (dashed curve). c CD spectra of 1∙2S and 1∙2R in dodecane (4.0 mM) at 298 K. d CD (354 nm)-monitored titration of 1 (4.0 mM) with 2S (1.4–6.0 mM) in dodecane at 298 K. e Cooling curves from 348 to 283 K at –1.0 K/min of 1∙2S in dodecane (4.0 mM) monitored with CD intensity at 354 nm and UV absorption at 385 nm. f AFM image of 1∙2S spin-coated on a HOPG substrate from a dodecane solution (4.0 mM). Scale bar, 200 nm. For a magnified image, see Supplementary Fig. 10a. g Schematic for the supramolecular polymerization of 1 and 2S. h Helical hydrogen-bonded network generally formed in the crystal structures of carboxylate salts of 2S (2R). See also Supplementary Fig. 7.
