Abstract
A UV/visible and pH-metric quantitative analysis of the spiropyran reversible photoacid 1-MEH allowed us to determine the pKa's of the open and closed forms, the rate constants of relaxation, the quantum yield of decolouration and the UV/visible spectra of the protonated and deprotonated open and closed isomers. The coupling between 1-MEH and a selected pH-indicator acidochromic dye via proton exchange has also been analysed. The initial pH, stoichiometric ratio between the photoacid and the pH-indicator, light intensity and pKa range of the pH-indicator have been established to maximize the proton transfer from the photoacid donor to the pH-indicator acidochromic dye acceptor. When the pKa's are matched, the two-component system behaves like a single photochromic dye. The proposed model explains why 1-MEH photo-switches BromoCresol Green but not Methyl-Orange.
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