Molecular Vibrations and Infrared Spectroscopy



Molecular Vibrations and Infrared Spectroscopy

These vibrations are called in plane vibrations. In such vibrations the distance between two bonded atoms increases or decreases but the mean position and bond axis remains the same. Stretching vibrations are of two types:

(a)   SYMMETRIC

These are the vibrations in which extension and compression occur in a symmetrical way. Such a mode of vibration does not cause any dipole change in the molecule and therefore, is not infrared active.

(b)   ASYMMETRIC

These are the vibrations in which one bond is compressing and the other bond is extending. Such a mode of vibration causes a change in the dipole of the molecule and is infrared active.

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