Section 11 - Mass Spectrometry and IR Spectroscopy
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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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