Spectroscopy Measurements

Fingerprint Region

1600-1000

C-H Bending

1000-600

C-H stretching

2850-2960

CF stretch

1000-1100

CF3

1300-1360

-CH=CH2, (terminal vinyl) stretch

1640

methylene vinyl stretch

1655

substituted internal alkene stretch

1660-1675 (sometimes absent)

=CH2 (SP2 Stretching)

3000-3100

-CH2=CH2 bends

910, 990 (two absorptions)

methylene vinyl bends

890

trans alkene bend

960-980

cis alkene

675-730

trisubstitued alkene bends

800-840

O-H stretch (Not H bond)

3600

OH stretch (h bond)

3200-3400

C-O stretch

1050-1200

Alkyne stretch

2100-2200

Terminal Alkyine =_ C - H stretch

3300

Benzene

1500 to 1600

C=O Stretch

1700

Aldehyde =C-H stretch

2700

carboxlyic OH stretch

2400 to 3600

benozic acid c=o stretch

1680

Esters C=O stretch

1735-1745

Nitriles C triple bond N

2200-2250

Anhydrides

Two C=O stretches, 1760, 1820

acid chloride

1800

amide c=O

1650-1675

Amide (general)

can differentiate between primary, secondary and tertiary by looking at N-H stretch

N-H Stretch

3200-3400

N-H bend

1640