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Transient quenching dependences 1 − IF/IF0 = f (τD) (a, c) of 1 in TOL (a) and CHCl3 (c) for corresponding quenching wavelengths λq. Time-resolved one-photon STED spectra of 1 (b, d) for τD = 0 ps (1, cyan circles), 2 ps (2, green circles), and 6 ps (3, red circles) in TOL (b) and CHCl3 (d). Normalized fluorescence spectra (b, d, curves 4) of 1 in TOL (b) and CHCl3 (d).
