Fig. 1. (A) Fluorescence response of HXPI-P to polarity. (B) Normalized absorption and corresponding (C) fluorescence emission spectra of HXPI-P (10 μM) in solvents with different polarities. Inset: the linear fitting curve of Δλemvs. the dielectric constant. λex = 635 nm. Δλem = λem (in an organic solvent) − λem (in water). Data are expressed as the mean ± SD of three separate measurements.
