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Vibrational Bending and Stretching
Vibrations can involve either a change of bond length, stretching, or bond angle, bending
(Figure 13-4).
Figure 13-4. Molecular Bending and Stretching
Stretching can be either asymmetrical or symmetrical (Figure 13-5).
Figure 13-5. Asymmetrical vs Symmetrical Stretching
Bending can be described in four separate modes (Figure 13-6).
Three important facts follow from the above:
1. Only the vibrations of a molecule's bonds can absorb infrared energy.
2. There are many possible modes of vibration.
3. Each vibrational mode may correspond to a distinct absorption peak in the
infrared spectrum of that molecule.
Chapter 13 Infrared Spectroscopy Tutorial
Figure 13-6. Molecular Bending
13-5
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