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.
5 Molecular Ion (parent ion, M) = molecular mass of the analyte; sample minus an electron Base peak- largest (most abundant) peak in a mass spectra; arbitrarily assigned a relative abundance of 100%. C 6H 6 m/z = 78.04695 m/z=78 (M+) (100%) m/z=79 (M+1) (~ 6.6% of M+) 6 The radical cation (M+•) is unstable and will fragment into smaller ions ...
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