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Stretching of cis-formic acid: warm-up and cool-down as molecular work-out

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Abstract

A new technique to rotationally simplify and Raman-probe conformationally and vibrationally excited small molecules is applied to the cistrans isomerism of formic acid. It quintuples the previously available gas phase vibrational data base on this excited form of a strongly anharmonic planar molecule despite its limited spectral resolution. The newly determined cis-formic acid fundamentals allow for a balanced vibrational benchmark on both rotamers of formic acid. Assuming the adequacy of vibrational perturbation theory, it reveals weaknesses of standard methods for these systems like B3LYP-D3(BJ)/aVQZ VPT2 or PBE0-D3(BJ)/aVQZ VPT2. The functionals ωB97-XD and M06-2X additionally suffer from severe integration grid size and symmetry dependencies. The vibrational benchmark suggests B2PLYP-D3(BJ)/aVQZ VPT2 and MP2/aVQZ VPT2 as partially competitive and in any case efficient alternatives to computationally demanding coupled cluster vibrational configuration interaction calculations. Whether this is due to fortuitous compensation between electronic structure and vibrational perturbation error remains to be explored.

Graphical abstract: Stretching of cis-formic acid: warm-up and cool-down as molecular work-out

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Publication details

The article was received on 30 Mar 2019, accepted on 15 May 2019 and first published on 16 May 2019


Article type: Edge Article
DOI: 10.1039/C9SC01555H
Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY license
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    Stretching of cis-formic acid: warm-up and cool-down as molecular work-out

    K. A. E. Meyer and M. A. Suhm, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C9SC01555H

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