ir infrared spectroscopy identify the functional group(s)
DESCRIPTION
Electromagnetic SpectrumTRANSCRIPT
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Infrared SpectroscopyIR
Identify the functional group(s)
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Electromagnetic Spectrum
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Energy
Amplitude
absorption radiation
Bond Vibrations
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CH
H
CH
HBending
CH
H
CH
HStretching
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Classical IR Spectrometer
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NaCl IR PlatesNaCl IR Plates
A drop of sample is place between the NaCl plates
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NaCl cell for solutions
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Wavenumber cm-1
E = h= hc/
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Characteristic IR Absorption Frequencies
C-H Alkanes 2850-2960C-H Alkenes 3020-3080C-H Arenes 3000-3100
C-O Alcohols, ethers 1080-1300
C=O Aldehydes, ketones... 1690-1760
O-H Alcohols 3200-3600Acids 2500-3000
N-H Amines 3300-3500
cm-1Bond
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-OH
C-H
-O-R
Alcohol
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PrimaryAmine
-NH2
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Secondary Amine
N-H
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Ketone
C=O
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Aldehyde
C=O
RCO-H
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Carboxylic Acid
OH
C=O
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Ester
C=OC-O
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Carbonyl group -- Ketone
Functional Group?
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Alcohol
Functional Group?
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Carboxylic Acid
Functional Group?
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Ester
Functional Group?
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amine (secondary)
Functional Group?
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C6H5COCH3
C8H8O
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isopropyl alcohol
C3H8O
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CH3COOCH2CH3
C4H8O2
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CH3COCH2CH2CH3
C5H10O