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Section 11 - Mass Spectrometry and IR Spectroscopy

Mass Spectrometry and IR Spectroscopy - Section 11 of Organic Chemistry Notes is 9 pages in length (page 11-1 through page 11-9) and covers ALL you'll need to know on the following lecture/book topics:


SECTION 11 - Mass Spectrometry and IR Spectroscopy


11-1 -- Mass Spectrometry (MS)
  · Molecular Weight Determination
  · Fragmentation into Smaller Radicals and Cations
  · Purpose of Magnetic Field
  · A Typical Mass Spectrum: n-Octane
  · Parent Peak and Base Peak
  · Mass-to-Charge Ratio (m/z)
  · Parent Ion (or “Molecular Ion”)
  · Fragment Peaks (Fragment Ions) and Isotope Peaks (Isotope Ions)
  · Relative Intensity
11-5 -- Review of Electromagnetic Radiation (“light”)
  · Energy Equations
  · Variables and Constants
  · Wavenumber (cm-1)
11-5 -- Infrared Spectroscopy
  · Definition of IR Spectroscopy
  · Graphical Plot of % Transmittance vs. Wavenumber (cm-1)
  · Stretching vs. Bending
  · The “Fingerprint Region”
11-7 -- Frequency (Wavenumber) and Intensity of IR Absorption
  · Types of IR Vibrations
  · Bond Strengths
  · CΞC > C=C > C-C
  · C(sp)-H > C(sp2)-H > C(sp3)-H
  · Frequency Dependence on Masses of Bonded Atoms
  · Intensity of Absorption and its Dependence on Dipole Moments
  · The Number of Identical Bonds Influences the Intensity of IR Peaks
11-8 -- Table of IR Stretches for Common Functional Groups
11-9 -- Four Sample IR Spectra


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