Exploring Resonance Raman Scattering with 4-Nitrophenol

• Catherine L. Jahncke ^[1] ; Wenyao Zhang ^[1] ; Bethany M. DeMuynck ^[1] ; Adam D. Hill ^[1]
  1. [1] St. Lawrence University

     St. Lawrence University

     Town of Canton, Estados Unidos

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 99, Nº 9, 2022, págs. 3233-3241
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Raman scattering is a powerful tool for revealing the vibrations of molecules, but as a nonlinear optical phenomenon, its signals can change via mechanisms like resonance enhancement that have no direct analogue in infrared spectroscopy. In this work, complementary measurements conducted on 4-nitrophenol and its conjugate base allow students to directly control the variables responsible for enhancement. Changing sample UV–vis absorbance with pH and excitation color with the addition of a diode laser allows students to explore the criteria for resonance Raman scattering: only the conjugate base and 405 nm laser in combination produce enhancement. Adjustments to the experiment make it suitable for either an upper-level undergraduate course lab or an independent inquiry project.