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(a) Time courses of fluoride-promoted Si-O bond cleavage reaction of 2, 3, 4, and 5 (2 μM) after addition of NaF (1 mM) in HEPES buffer solution pH 7.4 (contain 0.8% MeCN) and (b–e) Fluorescence spectral changes of 2 (b), 3 (c), 4 (d), and 5 (e) (2 μM) before (blue line) and after (red line) addition of NaF (1 mM) at 3 h incubation time in HEPES buffer solution pH 7.4 (contain 0.8% MeCN).
