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The UV–vis absorption spectra of the polymerized gel formed by compound 18A in ethanol (10 mg/mL): A, at room temperature after 3 min UV irradiation (λmax = 650 nm); B, at 50 °C ( λmax = 634 nm); C, at 60 °C incubation for 90 min (λmax = 534 nm, other peaks are 582, 636 nm); D, after heating at above 60 °C till complete color change to red (λmax = 486 nm together with 534 nm).
