Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 12 212 of 316Overview:Infrared (IR) spectroscopydeals mainly with:molecular vibrationsIR radiation islight.lowenergy relative to visibleIR wavelengths range (approximately) from:Wavelength (nm) Frequency (cm -1 )Near IR 1,000 – 2,500 10,000 – 4,000Mid IR 2,500 – 20,000 4,000 - 500Far IR 20,000 – 200,000 500 - 50Page 212 of 316
Chem 155 Unit 12 213 of 316Why is IR spectroscopy important?1. UV-Vis spectra are useful, but: all molecules:VibrateSo most all molecules have:Vibrational absorption spectraAnd most vibrational modes absorb:StronglySo IR spectroscopy is a very general and sensitiveanalytical tool.2. Vibrational spectra have a lot of information:a. Fingerprinting / IdentificationEach molecule has a complex but uniquesignature.b. QuantitationBeer’s law holds for vibrationalabsorption too!c. Measurement of Interactions / ConfigurationsVibrational frequencies (spectra) aresensitive to intermolecular interactions –so one can identify phenomena such ashydrogen bonding, trans or gaucheinteractions that may control reactivity ofmolecules.Page 213 of 316
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Full set of Notes with Fill-Ins - San Jose State University

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