Fig. 5. Optical micrographs for several gels: (a) compound 18 in EtOH : H2O (v/v 1 : 1) at 4.0 mg mL−1, (b) compound 20 in DMSO : H2O (v/v 1 : 1) at 4.0 mg mL−1, (c) compound 18 in DMSO : H2O (v/v 1 : 1) at 2.5 mg mL−1, (d–f) compound 18 in DMSO : H2O (v/v 1 : 1) and with added 2 equiv. of metal salts: (d) Zn(OAc)2, (e) Ni(OAc)2, (f) FeCl2, the gelator concentration was 2.5 mg mL−1, 5.1 mM.
