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Chemistry LibreTexts

2: Symmetry and Spectroscopy

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Symmetry operations, point groups, character tables, IR spectroscopy and selection rules, chiral molecules. Proton and multinuclear NMR spectroscopy. See your lab manual for the “Symmetry and Spectroscopy” experiment.

  • 2.1: Group Theory: Theory
  • 2.2: Understanding Character Tables of Symmetry Groups
  • 2.3: Group Theory
  • 2.4: Infrared - Theory
    Infrared (IR) spectroscopy is one of the most common and widely used spectroscopic techniques employed mainly by inorganic and organic chemists due to its usefulness in determining structures of compounds and identifying them. Chemical compounds have different chemical properties due to the presence of different functional groups.
  • 2.5: Infrared - Interpretation
    Infrared spectroscopy is the study of the interaction of infrared light with matter. The fundamental measurement obtained in infrared spectroscopy is an infrared spectrum, which is a plot of measured infrared intensity versus wavelength (or frequency) of light.
  • 2.6: NMR - Introduction
    Nuclear Magnetic Resonance (NMR) is a nuceli (Nuclear) specific spectroscopy that has far reaching applications throughout the physical sciences and industry. NMR uses a large magnet (Magnetic) to probe the intrinsic spin properties of atomic nuclei. Like all spectroscopies, NMR uses a component of electromagnetic radiation (radio frequency waves) to promote transitions between nuclear energy levels (Resonance). Most chemists use NMR for structure determination of small molecules.
  • 2.7: NMR - Interpretation
    NMR interpretation plays a pivotal role in molecular identifications. As interpreting NMR spectra, the structure of an unknown compound, as well as known structures, can be assigned by several factors such as chemical shift, spin multiplicity, coupling constants, and integration.
  • 2.8: NMR: Structural Assignment


2: Symmetry and Spectroscopy is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.

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