NMR

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Author:
eerobert
ID:
52100
Filename:
NMR
Updated:
2010-11-28 22:08:35
Tags:
Organic Chemistry
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Description:
Organic Chemistry Final Exam Nuclear Magnetic Resonance
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  1. Nuclear Magnetic Resonance Spectroscopy
    • Corresponds to an atom’s Nuclear Spin Energy State
    • Deals with an atom’s nucleus and its spin orientation in a magnetic field (B0­, aka H0)
  2. 2 Spin States
    • alpha: aligned with B0
    • beta: opposed to B0
  3. Standard NMR Experiment
    • 1. Dissolve sample in CDCl3 solvent (internal lock solvent)
    • 2. Place in a strong magnetic field, causing speration of
    • energy of spin states
    • 3. Irradiate sample with short rf pulse, causing alpha spin state to flip to beta spin state
    • 4. Allow nuclei to relax from beta to alpha spin state
    • 5. Detect E released and mathematically process data
    • 6. NMR Spectrum displayed as Intensity of Absorbance vs.Frequency (delta, chemical shift)
  4. Internal Standard
    TMS (tetramethylsilane, SiMe4) ppm = 0.00
  5. Basic Information Obtained from 13C Spectra
    • 1. Number of Signals
    • Indicates # of different types of Cs, i.e. chemically non-equivalent Cs
    • 2. Chemical Shift (delta)
    • Indicates type of chemical environment of C
  6. C=O
    150-200
  7. C=C
    100-150
  8. C-X
    50-100
  9. C-H
    0-50

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