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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.

is the Highest Occupied Molecular Orbital (HOMO) ψ 3 is the Lowest Unoccupied Molecular Orbital (LUMO) 18 UV-Vis light causes electrons in lower energy molecular orbitals to be promoted to higher energy molecular orbitals. HOMO LUMO Chromophore: light absorbing portion of a molecule Butadiene Butadiene

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