Rotational spectrum and internal dynamics of the hydrogen-bonded pyrrole-pyridine aromatic pair.
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ABSTRACT: Non-covalent interactions determine the three-dimensional structure and activity of biological molecules. In this work, the pyrrole-pyridine complex considered as a model of the NH⋯N hydrogen-bonded Watson-Crick base pairs has been generated in a supersonic expansion and characterized by chirped pulse Fourier transform microwave spectroscopy. The analysis of the unconventional spectral pattern of the 1:1 pyrrole-pyridine adduct and its 13C and 15N isotopologues reveal a non-planar complex, with a bent NH⋯N hydrogen bond and large amplitude motion of the pyrrole subunit. The bent structure is likely to arise from the stablishment of the secondary CH⋯N interaction between pyridine and pyrrole moieties.
SUBMITTER: Cabezas C
PROVIDER: S-EPMC7610520 | biostudies-literature |
REPOSITORIES: biostudies-literature
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