Electron density distribution plots of the barrier to internal rotation in acetaldehyde are examined. The barrier in this molecule is generic to those molecules possessing attractive dominant barriers, and the origin of this type of barrier is shown to be small-scale, covalent-like chemical bonding.
Miguel M. Ugeda, Aaron J. Bradley, Lucía Rodrigo, Min Yu, Wenjun Liu, Peter Doak, Alexander Riss, Jeffrey B. Neaton, T Don Tilley, Rúben Pérez, Michael F. Crommie
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