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INFRARED SPECTROSCOPY (IR). Infrared Spectroscopy. Chemical bonds absorb energy in the IR region related to the vibration of different bonds.

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infrared spectroscopy
Infrared Spectroscopy

Chemical bonds absorb energy in the IR region related to the vibration of different bonds.

Infra-red absorbance values are reported as units of wavelength (λ, μm) or more commonly as wave numbers (ν, cm-1) which are related to frequency.

ν = 1/λand v = c/λ

Ifλis in cm then wave numbers are calculated to be in cm-1.

Higher frequency and shorter wavelengths represent higher energy.

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ir vibrational modes
IR Vibrational Modes

There ate two types of bond vibrational modes: 1. stretching and 2. bending

ir absorbance regions
IR Absorbance Regions

Common Bond Stretching Regions in an IR Spectrum:

ir spectrum di n propyl ether
IR Spectrum: di-n-propyl ether

CH3CH2CH2-O-CH2CH2CH3