CHM247H1 Chapter Notes - Chapter 12: Spectroscopy, Systematic Chaos, Alkene
Document Summary
Infrared (ir) spectroscopy: a kind of optical spectroscopy that uses infrared energy. Corresponds to energies of 48. 0 kj/mol to 4. 80. 1) = 1 / (cm) kj/mol: all molecules have a certain amount of energy and are in constant motion, with their bonds stretching and contracting constantly, amount of energy a molecule contains is quantized (non-variable). A molecule can stretch or bend at specific frequencies corresponding to specific energy levels. When a molecule is irradiated with electromagnetic radiation, energy is absorbed if the frequency of the radiation matches the frequency of the vibration. This results in an increased amplitude for the vibration: we can find what kind of motions a molecule has by examining an ir spectrum since each frequency absorbed by a molecule corresponds to a specific motion. We can then determine the kinds of bonds (functional groups) present by examining the ir spectrum.
