CHM 2211 Chapter Notes - Chapter 15: Ketone, Unpaired Electron, Alkyne
Document Summary
Spectroscopy: used for structure determination: the nature of light, wavelength (lambda): describes the distance between adjacent peaks of an oscillating field. Frequency(v): describes the number of wavelengths that pass a particular point in space per unit time: wavelength and frequency are inversely proportional (v=c/lambda (c= constant. Photons: packets of energy; directly proportional to its frequency (e=hv speed of light) (h=planck"s constant=6. 6(cid:884)6 x (cid:883)(cid:882)^-34 jxs) Electromagnetic spectrum: range of all frequencies: ir spectroscopy, vibrational excitation. Ir radiation causes vibrational excitation of the bonds in a molecule; different types due to the different ways bonds store vibrational energy: stretching and beinding vibrations, identification of functional groups with ir spectroscopy. Energy gap for a c h bond is much larger than the energy gap for a c o bond: c h will absorb a higher energy in photons, the general shape of an ir absorbance spectrum.
