Abstract
This work represents the first demonstration of monitoring kinetics upon a light-induced pH jump by in situ rapid-scan (RS) electron paramagnetic resonance (EPR) spectroscopy on the millisecond time scale. Here, we focus on the protonation state of an imidazolidine type radical as a pH sensor under visible light irradiation of a merocyanine photoacid in bulk solution. The results highlight the utility of photoacids in combination with pH-sensitive spin probes as an effective tool for the real-time investigation of biochemical mechanisms regulated by changes in the pH value.
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