University of Illinois Urbana-Champaign

Vibrational Specificity Of Proton-transfer Dynamics In Electronically Excited 6-hydroxy-2-formylfulvene

Foguel, Lidor

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4839.pdf
TK02_4839.pdf

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https://hdl.handle.net/2142/111309

Description

Title
Vibrational Specificity Of Proton-transfer Dynamics In Electronically Excited 6-hydroxy-2-formylfulvene
Author(s)
Foguel, Lidor
Contributor(s)
  • Vaccaro, Patrick
  • Vealey, Zachary
Issue Date
2021-06-22
Keyword(s)
Comparing theory and experiment
Date of Ingest
  • 2021-09-24T21:09:29Z
  • 2022-01-21T16:08:42Z
Abstract
The transduction of protons between distinct donor and acceptor sites, as often directed by attendant hydrogen bonds, is a ubiquitous chemical transformation essential for all of acid/base chemistry, yet the role of selective nuclear displacements in this deceptively simple process remains a topic of active investigation. Polarization-resolved degenerate four-wave mixing (DFWM) spectroscopy was employed to investigate the vibrational specificity of proton-transfer dynamics in the lowest-lying singlet excited state, \textit{\~{A}}$^{1}$B$_{2}$ ($\pi$$^{*}$$\pi$), of 6-hydroxy-2-formylfulvene (HFF), with judicious selection of incident and detected polarization geometries allowing for the extraction of refined rotation-tunneling parameters. While the zero-point level of the ground electronic state [\textit{\~{X}}$^{1}$A$_{1}$] straddles the barrier crest for hydron migration and thus affords a prototypical example of low-barrier hydrogen bonding,\footnote{Z. N. Vealey, L. Foguel and P. H. Vaccaro, \textit{J. Phys. Chem. Lett.} \textbf{9}, 4949 (2018).} a dramatic change in dynamics has been suggested to accompany $\pi$$^{*}$$\leftarrow$ $\pi$ electron promotion, as reflected by a $>$1000-fold decrease in tunneling rate.\footnote{Z. N. Vealey, L. Foguel and P. H. Vaccaro, \textit{J. Phys. Chem. A.} \textbf{123}, 6506 (2019).} This talk will present complementary experimental and computational analyses of vibronic levels in the pertinent \textit{\~{A}}$^{1}$B$_{2}$ ($\pi$$^{*}$$\pi$) manifold designed to unravel the dependence of unimolecular reactivity on heavy atom motion and to elucidate the disparate behavior observed for analogous \textit{\~{X}}$^{1}$A$_{1}$ features.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/111309
DOI
10.15278/isms.2021.TK02

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Abstracts & Presentations - 2021 International Symposium on Molecular Spectroscopy PRIMARY