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Updated: Jun 11, 2025

Raman and IR Spectroelectrochemical Methods as Tools to Analyze Conjugated Organic Compounds
Published on: October 12, 2018
FullThrOTTLE-TrIR: Time-Resolved IR Spectroscopy of Electrochemically Generated Species Using a Full Throughput
Kerstin T Oppelt1, Peter Hamm1
1Department of Chemistry, University of Zurich, Zurich 8057, Switzerland.
Abstract:
An optically transparent thin-layer electrochemical cell with stopped-flow sample transport has been developed for optical-pump infrared-probe transient absorption spectroscopy of prereduced or preoxidized molecules. Time-resolved IR-spectra of Re(bpy)(CO)3X (X = Cl, Br) complexes in different oxidation states are presented as a proof-of-principle application for this combined electrochemical and spectroscopic tool. The excited-state lifetimes and IR-spectroscopic signatures of various oxidation states of the molecule, including follow-up reaction intermediates, are disentangled by kinetic sorting, using lifetime density analysis. The method can be applied to assign and differentiate molecular intermediates in photo- and electrochemical reactions, adding new analytic coordinates to classical FTIR- and UV-vis-spectroelectrochemistry.
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