Absorption bands cm⁻¹

Group Assignment (tentative)

1795

≡ C-C ≡, C=O stretch, (Carbonyl Carboxylic acids)

1772

1736

υ (C=O) stretch, (carboxylic acid, Saturated aliphatic aldehydes, Ketones)

1695

1648

C=C stretch, alkenes

1537

υ_as COO (Carboxylate ions)

1513

C-C stretch (in ring), aromatics

1460

CH₃ or CH₂ (Methyl bend or scissoring)

1425

υ_as COO, O-H bending

1396

CH₃ or CH₂

1337

CH₂ adjacent to ?C≡C-, or O-H bending of Alcohols and Phenols

1313

C-O stretch, alcohols, carboxylic acids, esters, ethers.

1266

C-O, O-H (H bonded)

1166

CH₂ wag.

1114

C-O Stretch, Alcohol, Ethers, Esters.

1067

C-C, or ?C=C\=C- (Allenes)

1031

Methoxy-metal, or Polydentate Carbonates