Fig. 4. (A) Normalized UV-vis absorbance spectra of 1 (7.25 mM), freshly dissolved in aqueous solution (red curve), in the same solution but containing 50 mM NaCl and annealed at 80 °C for 30 minutes (blue curve), and after gelation by adding 43 mM CaCl2 (green curve). (B) UV-vis absorbance spectra of compound 1′ under the same conditions described in (A).
