TY - JOUR
T1 - New Phenol Benzoate Cyanine Picolinium Salt Photoacid Excited-State Proton Transfer
AU - Green, Ori
AU - Gajst, Oren
AU - Simkovitch, Ron
AU - Shabat, Doron
AU - Huppert, Dan
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/4/27
Y1 - 2017/4/27
N2 - Steady-state and time-resolved fluorescence techniques were employed to study the excited-state proton transfer (ESPT) to water and D2O of a new photoacid, phenol benzoate cyanine picolinium salt (BCyP). We found that the ground-state pKa is about 6.5, whereas the excited-state pKa∗ is about -4.5. The ESPT rate constant, kPT, to water is ∼0.5 × 1012s-1 (τPT ≈ 2 ps) and in D2O the rate is 0.33 × 1012 s-1. We determined that the BCyP photoacid belongs to the third regime of photoacids, the solvent-controlled regime.
AB - Steady-state and time-resolved fluorescence techniques were employed to study the excited-state proton transfer (ESPT) to water and D2O of a new photoacid, phenol benzoate cyanine picolinium salt (BCyP). We found that the ground-state pKa is about 6.5, whereas the excited-state pKa∗ is about -4.5. The ESPT rate constant, kPT, to water is ∼0.5 × 1012s-1 (τPT ≈ 2 ps) and in D2O the rate is 0.33 × 1012 s-1. We determined that the BCyP photoacid belongs to the third regime of photoacids, the solvent-controlled regime.
UR - http://www.scopus.com/inward/record.url?scp=85020231000&partnerID=8YFLogxK
U2 - 10.1021/acs.jpca.7b02490
DO - 10.1021/acs.jpca.7b02490
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AN - SCOPUS:85020231000
SN - 1089-5639
VL - 121
SP - 3079
EP - 3087
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
IS - 16
ER -