Transcription of Chapter 13: Spectroscopy - Vanderbilt University
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Chapter 13: Spectroscopy - Vanderbilt University
11 Chapter 13: SpectroscopyMethods of structure determination Nuclear magnetic Resonances (NMR) Spectroscopy (Sections ) Infrared (IR) Spectroscopy (Sections ) Ultraviolet-visible (UV-Vis) Spectroscopy (Section ) Mass (MS) spectrometry (not really Spectroscopy )(Section )Molecular Spectroscopy : the interaction of electromagnetic radiation (light) with matter (organic compounds). Thisinteraction gives specific structural information. : Mass Spectrometry: molecular weight of the sample formulaThe mass spectrometer gives the mass to charge ratio (m/z), therefore the sample (analyte) must be an spectrometry is a gas phase technique- the sample mustbe vaporized. Electron-impact ionizationSample Inlet10-7 - 10-8 torrR-Helectron beam 70 eV (6700 KJ/mol)e_R-H+massanalyzerm/zionization chamber(M+) u23 mass mcharge z==B2 r22VB= magnetic field strengthr = radius of the analyzer tubeV= voltage (accelerator plate)The Mass SpectrometerIonizationchamberIons of selectedmass/charge ratioare detectedIons of non-selectedm
- identify functional groups Radiowaves: nuclear spin in a magnetic field (NMR) - gives a map of the H and C framework organic molecule (ground state) light hν organic molecule (excited state) organic molecule (ground state) + hν relaxation 16 13.23 Ultraviolet-Visible (UV-Vis) Spectroscopy λ 200 UV 40 800 nm Vis Recall bonding of a π-bond ...
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