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Change in pyrene I3/I1 ratio after the addition of 0 (△), 1 (□), 10 (◇), and 100 equiv ( ×) of cleaving agent to the pyrene-containing SCMs in deionized water at ambient temperature. (a) Cross-linker = 2a, cleaving agent = HIO4. (b) Cross-linker = 11, cleaving agent = 13. [1] = 20 μM. (Reprinted with permission from ref (18). Copyright 2010, American Chemical Society, Washington, DC.)
