Figure 12.

(a) Structure of the PA responsive Ca²⁺ chemosensor 19 reported by Mishra et al. (111); (b) PA contrast of 19 is illustrated with varying Ca²⁺ concentrations. Irreversibility of Ca²⁺ binding is also illustrated in the presence of EDTA. Reproduced with permission from ref. 111. Copyright 2016 American Chemical Society.