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Transient absorption generated by UV irradiation (λ = 355 nm) for azo-dyes 8 (right) and 9 (left) in ethanol at 298 K ([AZO] = 20 μM, λobs = 420 nm for 8 and 405 nm for 9). From [56] – Reprinted with permission from Org. Lett. © 2010, American Chemical Society.
