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. 2014 Jun 24;4:5418. doi: 10.1038/srep05418

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Fluorescent spectra of 10 μM 1 (a) in ethylene glycol-glycerol mixtures with varied solvent viscosity (η), excited at 370 nm. Inset: the linearity between log(I₅₄₀/I₄₁₅) and logη; (b) in ethylene glycol-glycerol mixtures, excited at 430 nm. Inset: the linearity between logI₅₄₀ and logη; (c) at different temperatures in ethylene glycol-glycerol mixture (40/60, v/v), excited at 370 nm. Inset: the linearity between log(I₅₄₀/I₄₁₅) and temperature. (d) Fluorescence lifetime of 10 μM 1 at 540 nm in ethylene glycol-glycerol mixtures with varied solvent viscosity. Inset: the linearity between logτ and logη.