CHEM 2OA3 Lecture 2: Podcast 2 Infrared
7 Feb 2017
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Light can be thought of as waves of energy or packets of energy called. Properties of light waves include wavelength and frequency and energy. Small wavelength, high frequency (high energy) : Vacuum uv: more energy per packet of light than visible light - reason for sunburns. In nuclear magnetic resonance, we"re using that frequency to assign molecules. Nmr spectroscopy: radio waves, can obtain the specific arrangement of all carbon and hydrogen atoms in the compound, lousy at telling us about a. Ir spectroscopy: infrared, can obtain the functional groups present in the compound, but nothing about the chain length (i. e. : methanol vs ethanol vs propanol) Uv-vis spectroscopy: visible and ultraviolet, can obtain any conjugated pi system present in the compound, double bonds that are joined together (i. e. : benzene ring: nucleic acids, proteins) In infrared spectroscopy, we are looking at absorption of light by individual molecules.
