We demonstrate the use of the Z-scan technique as a method to measure a chemical parameter, the value, that characterizes the equilibrium constant in acid–base reactions. The measurements were performed with picosecond pulses at 532 nm in Fe(III)-meso-tetrakis(4-N-methyl-pyridyl) porphyrin. The results were compared with linear absorption measurements and electron paramagnetic resonance, the usual techniques employed to determine values in aqueous solutions, and showed excellent agreement.
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