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IR spectroscopy, . - Coggle Diagram
IR spectroscopy
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fundamental vibration
(a) Stretching. In this type of vibrations, the distance between the two atoms increases or decreases
but the atoms remain in the same bond axis.
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(b) Bending. In this type of vibrations, the positions of the atoms change with respect to the original
bond axis.
Scissoring. In this type, two-atoms approach each other.
Rocking. In this type, the movement of the atoms takes place in the same direction.
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Twisting. In this type, one of the atoms moves up the plane while the other moves down the
plane with respect to the central atoms.
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Degrees of freedom
The number of degrees of freedom is equal to the sum of the co-
ordinates necessary to locate all the atoms of a molecule in space.
Infra-red spectrum is an important record which gives sufficient information about the structure
of a compound.
linear molecule, there are only two degrees of rotation.
non-linear molecule, there are three degrees of rotation
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