Large jumps in pH on the nanosecond timescale can be achieved upon one- and two-photon flash photolysis of novel coumarinylmethyl esters, which are phototriggers for H+ (see scheme, F=pH-sensitive fluorescence indicator). The compounds are excellent tools for the study of rapid H+-triggered processes, for example, proton migration along membrane surfaces.
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Geißler et al. (2005) studied this question.
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