How to distinguish functional groups by ir spectroscopy?
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Vibrating bonds in functional groups absorb energy at a frequency that corresponds to the vibrational frequency of the bond.
In organic chemistry, this corresponds to frequencies of 15 to 120 THz.
These frequencies are expressed as wavenumbers:
wavenumber=frequencyspeed of light=fc
The wavenumbers range from 500 to 4000 cm⁻¹.
If the frequency of the radiation matches the vibrational frequency, the bond will absorb the radiation. The amplitude of the vibration will increase.
Within a narrow range, each type of bond vibrates at a characteristic wavenumber. This makes infrared spectroscopy useful for identifying functional groups in a molecule.
In organic chemistry, this corresponds to frequencies of 15 to 120 THz.
These frequencies are expressed as wavenumbers:
wavenumber=frequencyspeed of light=fc
The wavenumbers range from 500 to 4000 cm⁻¹.
If the frequency of the radiation matches the vibrational frequency, the bond will absorb the radiation. The amplitude of the vibration will increase.
Within a narrow range, each type of bond vibrates at a characteristic wavenumber. This makes infrared spectroscopy useful for identifying functional groups in a molecule.
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