Steady-state and time-resolved fluorescence techniques were employed to study the excited-state proton transfer (ESPT) to water and DO of a new photoacid, phenol benzoate cyanine picolinium salt (BCyP). We found that the ground-state pK is about 6.5, whereas the excited-state pK* is about -4.5. The ESPT rate constant, k, to water is ∼0.5 × 10s (τ ≈ 2 ps) and in DO the rate is 0.33 × 10 s. We determined that the BCyP photoacid belongs to the third regime of photoacids, the solvent-controlled regime.
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http://dx.doi.org/10.1021/acs.jpca.7b02490 | DOI Listing |
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