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. 2021 May 14;8(13):2100328. doi: 10.1002/advs.202100328

Figure 1.

Figure 1

Representative examples of the pH‐responsive DNA structures a–c), organic molecule d), and coordination bonds e). a) Working cycle of an i‐motif structure. Reproduced with permission.[ 63 ] Copyright 2003, Wiley‐VCH. b) Reversible formation of two pH‐responsive three‐base complex. Reproduced with permission.[ 20 ] Copyright 2017, Wiley‐VCH. c) The pH‐responsive A+•C wobble base pairs. d) Schematic diagram of pH‐responsive ethylenediamine (EN). Reproduced with permission.[ 24 ] Copyright 2018, Wiley‐VCH. e) The pH‐triggered release of Zn2+‐ion cofactors form ZIF‐8. Reproduced with permission.[ 41 ] Copyright 2019, Wiley‐VCH.