Issue 43, 2022

Coupled proton vibrations between two weak acids: the hinge complex between formic acid and trifluoroethanol

Abstract

When formic acid and 2,2,2-trifluoroethanol are co-expanded through a slit nozzle into vacuum, a single dominant, hinge-like 1 : 1 complex is formed in significant amounts and its two OH stretching fundamentals separated by 100 cm−1 can be unambiguously assigned by a combination of infrared absorption and Raman scattering. Quantum chemical calculations at different levels reproduce this finding in a satisfactory way and suggest that in-phase (Raman-sensitive and lower wavenumber) OH stretch excitation more or less along the concerted degenerate proton transfer coordinate in the hydrogen-bonded ring stays below the barrier for this concerted exchange. Anharmonic calculations indicate only weak intensity sharing with dark states coming into reach due to the hydrogen bond downshift of the OH stretching vibration. This well-behaved system sets the stage for acid combinations with more basic alcohols, where the in-phase OH stretching vibration is more difficult to detect, possibly due to fast intra-complex vibrational dynamics. It thus provides a benchmark point from which one can explore the evolution of vibrational resonances when the acidic proton meets a more electron-rich alcoholic oxygen.

Graphical abstract: Coupled proton vibrations between two weak acids: the hinge complex between formic acid and trifluoroethanol

Supplementary files

Article information

Article type
Paper
Submitted
08 9 2022
Accepted
19 10 2022
First published
20 10 2022
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2022,24, 26449-26457

Coupled proton vibrations between two weak acids: the hinge complex between formic acid and trifluoroethanol

S. M. Schweer, A. Nejad and M. A. Suhm, Phys. Chem. Chem. Phys., 2022, 24, 26449 DOI: 10.1039/D2CP04176F

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