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Pyridine–acetaldehyde, a molecular balance to explore the n→π*interaction Blanco Rodríguez, Susana Macario Farto, Alberto López Alonso, Juan Carlos Espectroscopía de rotación Quimica Quimica Fisica Producción Científica The complex pyridine–acetaldehyde is formed through an n->pi* interaction and a C‐H∙∙∙O contact. The acetaldehyde methyl group internal rotation induces a phase‐locked intermolecular oscillation along the Bürgi‐Dunitz coordinate. Surprisingly, this sort of molecular balance extracts energy through the n->pi* interaction to reduce the size of the internal rotation barrier. 2021-04-26T18:49:28Z 2021-04-26T18:49:28Z 2019 info:eu-repo/semantics/article Physical Chemistry Chemical Physics, 2019, 21, 20566-20570 1463-9076 http://uvadoc.uva.es/handle/10324/46376 10.1039/c9cp04088a 20566 37 20570 Physical Chemistry Chemical Physics 21 1463-9084 spa https://pubs.rsc.org/en/content/articlelanding/2019/cp/c9cp04088a#!divAbstract info:eu-repo/semantics/openAccess Royal Society of Chemistry Royal Society of Chemistry SI