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Fluorescence emission of the solid sample of (i) complex 2 (λem = 437 nm), (ii) complex 3 (λem = 438, 463 nm), (iii) complex 1 (λem = 434, 463 nm), (iv) complex 4 (λem = 439 nm), and (v) complex 5 (λem = 448 nm) (λex = 350 nm in all cases).
