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Evolution of the UV–vis absorption spectra of a solution of (A) [1a](PF6)2, (B) [2a](PF6)2, (C) [1b](PF6)2, and (D) [2b](PF6)2 in CH3CN upon irradiation with a 413 nm LED (5.38 × 10–8 mol photons·s–1) under N2 at 298 K. Conditions: (A) 15 min, 94 μm; (B) 60 min, 73 μm; (C) 15 min, 50 μm; (D) 180 min, 48 μm.
