New Phenol Benzoate Cyanine Picolinium Salt Photoacid Excited-State Proton Transfer

Ori Green, Oren Gajst, Ron Simkovitch, Doron Shabat, Dan Huppert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

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-1PT ≈ 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.

Original languageEnglish
Pages (from-to)3079-3087
Number of pages9
JournalJournal of Physical Chemistry A
Volume121
Issue number16
DOIs
StatePublished - 27 Apr 2017

Funding

FundersFunder number
Israel Science Foundation914/12

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