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Changes in the UV–vis absorption spectrum (toluene, 298 K) starting from (a) cis-SG1 (50 μM) upon irradiation with 385 nm light for 2 min to PSS385 and (b) trans-SG1 (30 μM) upon irradiation with 365 nm light for 1.5 min to PSS365. 1H NMR spectra (DMSO-d6, 298 K, 400 MHz) of (c) trans-SG1 (4 mM), (d) after irradiation with 365 nm light for 15 min to PSS365 (cis:trans = 33:67), and (e) after subsequent irradiation with 385 nm for 15 min to PSS385 (trans:cis ≥ 99:1).
