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

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Chem 155 Unit 13 Page 242 <strong>of</strong> 316Group frequencies: a pleasant fiction!Most molecules have many atoms.That means many modes! Some very complex!But –some functional groups behave like small molecules!Characteristic groupmodes and show up inIR spectra.Examples <strong>of</strong> ‘groups’:• C-H• C=O• C≡N• NH 3• OH etc.3N-6 rule irrelevant tothis analysisν is somewhatvariable because:• environment• other bonds• other modesinfluence the groupvibration.Page 242 <strong>of</strong> 316

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