Hydrogen Bonding Using NMR: A New Look at the 2,4-Pentanedione Keto-Enol Tautomer Experiment

• Theresa Julia Zielinski ^[1] ; Alexander Grushow ^[2]
  1. [1] Monmouth University

     Monmouth University

     Borough of West Long Branch, Estados Unidos

     
  2. [2] Rider University

     Rider University

     Township of Lawrence, Estados Unidos

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 79, Nº 6, 2002, pág. 707
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • A number of modifications to the standard keto–enol experiment in the physical chemistry laboratory are suggested for using modern NMR instruments now available in many chemistry departments. These modifications include sample preparation using a deuterated solvent for FT–NMR frequency locking, in-depth analysis of a proton spectrum acquired with a medium field (~300 MHz) NMR, examination of the temperature dependence of equilibrium processes, and multinuclear investigations. Remote access to the instrument and subsequent data analysis facilitated by the Internet are discussed. These methods permit students to learn about a wide variety of concepts within an integrated single-experiment design. We include student data in our analysis and an overview of possible extensions to the experiment.