chapter12

chapter12 - 12-12-1Organic Organic...

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Unformatted text preview: 12-12-1Organic Organic ChemistryChemistryWilliam H. BrownWilliam H. BrownChristopher S. FooteChristopher S. FooteBrent L. IversonBrent L. Iverson12-12-2Infrared Infrared Spectroscopy Spectroscopy Chapter 12Chapter 1212-12-3Electromagnetic RadiationElectromagnetic RadiationElectromagnetic radiation:Electromagnetic radiation:light and other forms of radiant energyWavelength (Wavelength ():):the distance between consecutive peaks on a waveFrequency (Frequency ():):the number of full cycles of a wave that pass a given point in a secondHertz (Hz):Hertz (Hz):the unit in which radiation frequency is reported; s-1 (read per second)12-12-4Electromagnetic RadiationElectromagnetic RadiationCommon units used to express wavelengthAngstrom ()1  = 10-10 mRelationto MeterUnit1 mm = 10-3 m1 nm = 10-9 m1 = 10-6 ( 29 ( 29 ( 29 ( 29----12-12-5Molecular SpectroscopyMolecular SpectroscopyMolecular spectroscopy:Molecular spectroscopy:the study of which frequencies of electromagnetic radiation are absorbed or emitted by a particular substance and the correlation of these frequencies with details of molecular structurewe study three types of molecular spectroscopyVibrational energy levelsNuclear spin statesElectronic energy levelsInfraredRadio fequencyUltraviolet-visibleAbsorption ofElectromagneticRadiation Results in Transition BetweenRegion of theElectromagneticSpectrumNuclear magneticresonanceInfraredUltraviolet-visibleType of Spectroscopy12-12-6Infrared SpectroscopyInfrared SpectroscopyThe vibrational IR extends from 2.5 x 10-6 m (2.5 m) to 2.5 x 10-5 m (25 m)the frequency of IR radiation is commonly expressed in wavenumberswavenumber :wavenumber :the number of waves per centimeter, with units cm-1 (read reciprocal centimeters)...
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chapter12 - 12-12-1Organic Organic...

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