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. Author manuscript; available in PMC: 2018 Feb 12.
Published in final edited form as: Chemistry. 2016 Mar 23;22(18):6361–6367. doi: 10.1002/chem.201600547

Figure 2.

Figure 2

A) Absorption and fluorescence emission spectra of 1 a in MeOH/PBS (3:1, v/v, pH7.4, 10 mM PBS) solution; B) pH-dependent UV/Vis absorption spectrum of 1 a; C) pH-dependent fluorescence emission intensity of 1 a with different excitation wavelengths (detailed emission spectra were shown in Figure S15, the Supporting Information); D) Schematic illustration of the photo-induced deprotonation of the N-hydroxyl group of 1 a at the excited state; E) Electron density of HOMO and LUMO for 1 a computed by density functional theory (DFT).