Resumen de NMR Determination of Internal Rotation Rates and Rotational Energy Barriers:: A Physical Chemistry Lab Project

Kevin F. Morris, Luther E. Erickson

• This article describes an experiment suitable for Physical Chemistry laboratories. It consists of an improved method to analyze the kinetics of internal rotation around the C-N amidic bond. The improvement over traditional experiments relies on the use of a saturation transfer NMR technique which allows the expansion of the typically narrow temperature range available in conventional NMR lineshape analysis experiments with dimethylacetamide.

  This experiment will expose students to a variety of NMR techniques, such as saturation transfer, inversion-recovery, and lineshape analysis. It will also demonstrate that NMR is an extremely useful tool to chemists, with very relevant applications in physical chemistry.