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(A) Normalized absorption and emission spectra of 10−5 M HPIP in neutral water (—) and in paraffin oil (—) at 20°C. Excitation wavelength, 320 nm. (B) Plot of the wavelength of the maximum proton-transfer emission intensity of HPIP in paraffin oil (○) and in cyclohexane (•) as a function of η/T, and in DMPC at 30°C (▪) and 15°C (∗).
