The application of merocyanine photoacids has been previously largely limited to neutral and acidic pH values. Here we introduce a new merocyanine photoacid with superior pH switching qualities. By increasing the pKa in the dark (pKadark) and the solubility we increased the reversible visible light induced pH jump to 3.5 units. Moreover, it is the first demonstration of a merocyanine photoacid able to generate a significant pH drop from a basic (pH 8.3) to an acidic (pH 5.2) environment.
All the synthetic, spectroscopic and other supporting data and analysis.
All NMR, UV-vis absorption, pH data
All the NMR, UV-vis and pH data, and processed data in origin and excel files.