Characterizing the n→π* interaction of pyridine with small ketones: a rotational study of pyridine⋯acetone and pyridine⋯2-butanone

The main interactions between pyridine and small ketones are a N⋯CO n→π* tetrel bond and a C–H⋯O weak hydrogen bond as shown in this rotational study of the complexes pyridine⋯acetone and pyridine⋯2-butanone.