Chapter 13 NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY Chapter 13: Nuclear Magnetic Resonance Spectroscopy.

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Presentation transcript:

Chapter 13 NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY Chapter 13: Nuclear Magnetic Resonance Spectroscopy

SOME BASICS OF ELECTROMAGNETIC INTERACTIONS Chapter 13: Nuclear Magnetic Resonance Spectroscopy

H-NUCLEI (PROTONS) IN AN EXTERNAL MAGNETIC FIELD Chapter 13: Nuclear Magnetic Resonance Spectroscopy

MAGNETIC SHIELDING Chapter 13: Nuclear Magnetic Resonance Spectroscopy

SIGNALS OF METHANOL UPFIELDDOWNFIELD

Fig. 13.5

60 MHz Spectrum 300 MHz Spectrum

SAME SPECTRUM WITH CHEMICAL SHIFTS IN PPM  3.4 ppm  4.8 ppm

CompoundElectronegativity CH 3 I CH 3 Br CH 3 Cl CH 3 F

0.2 ppm 3.0 ppm 5.3 ppm 7.3 ppm NUMBER OF ELECTRONEGATIVE ATOMS (GROUPS)

THE EFFECT OF DISTANCE  = 0.9 ppm  = 3.4 ppm  = 1.7 ppm  = 1.3 ppm

CH 2 CH 2 CH 2 CH 2 Br 300 MHz 60 MHz