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Photophysical properties of the reported probes 1–5. (a) Absorption (dashed) and emission (solid) spectra of compounds 1–5 in toluene. (b–f) Absorption (dashed) and emission (solid) spectra in different solvents for compounds 1 (b), 5 (c), 2 (d), 3 (e), 4 (f). The emission spectra were normalized to 0.1 intensity at the excitation wavelengths.
