Unravelling the early photochemical behavior of (8-substituted-7-hydroxyquinolinyl)methyl acetates through electronic structure theory and ultrafast transient absorption spectroscopy

Jiani Ma, Jan Michael Mewes, Kyle T. Harris, Timothy M. Dore, David Lee Phillips, Andreas Dreuw

Research output: Contribution to journalArticlepeer-review

Abstract

The photophysical processes and photochemical reactions in the ultrafast time region of (8-bromo-7-hydroxyquinolin-2-yl)methyl acetate (BHQ-OAc) in acetonitrile and neutral aqueous solutions were investigated using quantum chemical calculations and femtosecond transient absorption spectroscopy. After initial excitation into the π,π∗ excited state, BHQ-OAc undergoes an ultrafast intersystem crossing (ISC) into a π,π∗ excited triplet state on a timescale of 16 ps. The n,π∗ and π,π∗ excited singlet and triplet states involved in the photochemistry were identified by means of their characteristic excited state absorption (ESA) bands and from second order coupled-cluster (CC2) calculations. The high ISC rate of BHQ-OAc and related compounds is traced back to involvement of almost energetically degenerate n,π∗ excited states that enable efficient ISC that obeys El-Sayed's rules.

Original languageEnglish (US)
Pages (from-to)1089-1096
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number2
DOIs
StatePublished - 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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