IR Absorption Bands

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Cameron Dieselman's picture

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Right: #
Wrong: #
# Right & # Wrong of #

C-(triple bonded)-N

2260-2220 cm-1

C-(triple bonded)- C

2260-2210 cm-1

C-(double bonded) - C

1680-1600 cm-1

C-(double bonded)-N

1650-1550 cm-1

C-(double bonded)-O

1780-1650 cm-1

Benzene Ring

1600 and 1500-1430 cm-1


1250-1050 cm-1


1230-1020 cm-1

O--H (alcohol)

3600-3200 cm-1

O--H (Carboxylic acid)

3300-2500 cm-1


3500-3300 (double peaked)

C-(triple bonded) - C--H

3300 cm-1

C-(double bonded) - C---H

3200-3020 cm-1


2960-2850 cm-1

C---H (in aldehyde)

2850-2720 cm-1

sp3 carbons (CH3-, -CH2-, -CH--)

1450-1420 cm-1

sp3 carbons (methyl groups)

1450-1420 and 1385-1365 cm-1

terminal alkene (monosubstituted)

990 and 910 cm-1

terminal alkene (disubstituted)

890 cm-1

trans alkene

980-960 cm-1

cis alkene

730-675 cm-1

trisubstituted alkene

840-800 cm-1