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a Absorption spectra of compound 2 in chloroform before (black), after exposure to 1 h 400 nm (red) and after exposure to 1 h 480 nm radiation (green). The spectra are normalized to illustrate the spectral shift. b Fluorescence spectra of 2 in deuterated chloroform: before (black), after 400 nm (red) and after 480 nm (green) irradiation, respectively (λex=426 nm)
