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ADINA INSTITUTE OF SCIENCE AND TECHNOLOGY
SUBMITTED BY : VAISHALI CHOURASIA EC – VIII SEM
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WHAT IS IR SPECTROSCOPY?
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Infrared spectroscopy deals with the interaction between a molecule and radiation from IR region of the EM spectrum (IR region = 4000 – 400 cm-1 ) the cm-1 unit is the wave no. scale and is given by 1/(wavelength in cm). IR radiation causes the excitation of the vibration of covalent bonds within that molecule. These vibrations include the stretching and bending modes.
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WHAT ARE THE DIFFERENT REGIONS IN IR SPECTROSCOPY ?
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IR spectrum is split into two appropriate regions and they are :
4000 – 1000 cm-1 known as the functional group region, and < 1000 cm-1 known as the finger print region.
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WHAT IS THE IMPORTANCE OF FUNCTIONAL GROUP?
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Most of the information that is used to interpret an IR spectrum is obtained from the functional group region.
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IMPORTANT THINGS TO REMEMBER…
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When analysing an IR spectrum avoid the temptation to try to assign every peak. The finger print region , however can be useful for helping to confirm a structure by direct comparison with a known spectra.
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