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(a) Chemical structure and molecular geometry of BT. (b) and (c) Fluorescence spectra of BT in THF/water mixtures with different volume fractions of water (fw), (b) fw = 0 to 60 vol%, (c) fw = 70 to 95 vol%. (d) and (e) Plot of peak fluorescence intensity of BT versus fw in THF/water mixtures, (d) fw = 0 to 60 vol%, (e) fw = 70 to 95 vol%. [BT] = 10 μM; excitation wavelength λex = 420 nm.
