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Issue 17, 2017
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Correcting the record: the dimers and trimers of trans-N-methylacetamide

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Abstract

The dimer of trans-N-methylacetamide serves as a simple model for hydrogen bonds in peptides, free of any backbone distortions. Its preferred structures represent benchmark systems for an accurate quantum chemical description of protein interactions. The trimer allows for either two linear or three strained hydrogen bonds, with the former being the only structural motif considered so far in the literature, but the latter winning in energy by a large margin due to London dispersion. A combination of linear Raman and infrared supersonic jet techniques with B3LYP-D3/aug-cc-pVTZ quantum chemical predictions corrects earlier tentative spectroscopic assignments based on a hybrid density functional without dispersion correction. Linear Amide I–III infrared spectra of the jet-cooled monomer are compared to those recently obtained by action spectroscopy.

Graphical abstract: Correcting the record: the dimers and trimers of trans-N-methylacetamide

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Publication details

The article was received on 22 Nov 2016, accepted on 21 Dec 2016 and first published on 03 Jan 2017


Article type: Paper
DOI: 10.1039/C6CP07989J
Citation: Phys. Chem. Chem. Phys., 2017,19, 10727-10737
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    Correcting the record: the dimers and trimers of trans-N-methylacetamide

    T. Forsting, H. C. Gottschalk, B. Hartwig, M. Mons and M. A. Suhm, Phys. Chem. Chem. Phys., 2017, 19, 10727
    DOI: 10.1039/C6CP07989J

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