CHMB42H3 Lecture Notes - Lecture 5: Infrared Spectroscopy, Absorption Band, Electromagnetic Spectrum
Document Summary
Lecture outline characteristic infrared absorption bands intensity of absorption bands the shape of the absorption bands the absence of absorption bands the fragmentation patterns of functional groups infrared inactive vibrations infrared spectrum interpretation. Spectroscopy and the electromagnetic spectrum spectroscopy is a study of the interaction of matter and electromagnetic radiation a continuum of different types of electromagnetic radiation: each associated with a particular energy range. Makes up the electromagnetic spectrum high frequency / short wavelength = high energy: cosmic rays, gamma rays, x rays, uv light low frequency / long wavelength = low energy, radio waves / nmr, microwaves, infrared radiation. Aka hertz: high wavenumber = high energy. Mainly stretching vibrations: due to stronger bonds, high energy, bending vibration a vibration that does not occur along the line of the bond requires lower energy. Infrared spectra of hydrocarbons all hydrocarbons give absorption peaks in the 2800-3300 cm-1 region that are associated with c-
