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Spectral changes during the irradiation of cis-2 (A) in ACN after 0 (red), 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048 and 4096 s; (λir = 313 nm, l = 1 cm) and trans-2 (B) in ACN after 0 (red), 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024 and 2048 s; (λir = 313 nm, l = 1 cm).
