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. 2018 Jun 26;18(7):2042. doi: 10.3390/s18072042

Figure 2.

Figure 2

(a–d) The normalized UV-Vis absorption spectra of 2 (a), 3 (b), 4 (c), and 5 (d) (7.2 µM) in HEPES buffer pH 7.4 (contain 3% MeCN) before (blue line) and after (red line) incubation with NaF (12.5 mM) for 1 h (the absolute absorption spectra are shown in Figures S19–S22 in the SM) and (e,f) the UV-Vis absorption spectra of 2, 3, 4, and 5 (7.2 µM) in HEPES buffer pH 7.4 (contain 3% MeCN) after incubation with NaF (12.5 mM) for 1 h compared with the UV-Vis absorption spectra of the corresponding non-silylated coumarins 1 (e) and 6 (f).