Figure 61.

The gel formed by compound 105f in ethanol at below10 mg/mL. (a) a clear solution of the heated gelator, (b) a stable gel after cooling to room temperature, (c) the gel turned blue after irradiation of UV lamp from the top of the glass vial, (d) the gel was transferred to a quartz tube and irradiated for 1 min, (e) the same gel turned dark blue after UV treatment for 3 min, (f) the red gel was obtained by heating the gel in (e). Reprinted with permission from [31]. Copyright 2011 Beilstein-Institut.