Chapter 12 - Structure Determination: Mass Spectrometry And Infrared Spectroscopy Page 15
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44Bond Properties
The natural frequency of vibration of a bond is given by the
equation:
where µ = m
m
/(m
+m
) (termed the 'reduced mass'), and c
1
2
1
2
is the velocity of light.
K is a constant that varies from one bond to another. Force
constants for triple bonds are three times those of single
bonds.
Stronger bonds have a large force constant K and vibrate at
higher frequencies
Bonds between atoms of higher masses vibrate at lower
frequencies than bonds between lighter atoms.
15
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