Octet

Octet / Ir Table

Anhydride C=O

Anhydride C=O absorbs in the IR at 1740-1840 cm⁻¹. Intensity: strong, band shape: Two peaks. Use this range to identify the group from an IR spectrum.

Ir Table details

Functional Group

Anhydride C=O

Wavenumber Range

1740-1840

Intensity

strong

Appearance

Two peaks

This is one row of the Spectroscopy sheet - print all 28 IR absorptions on one page.

Ir Table

Related Content

Source collection

Alcohol O-H

Alcohol O-H absorbs in the IR at 3200-3600 cm⁻¹. Intensity: strong, band shape: Broad. Use this range to identify the group from an IR spectrum.

Carboxylic acid O-H

Carboxylic acid O-H absorbs in the IR at 2500-3300 cm⁻¹. Intensity: strong, band shape: Very broad, often overlaps C-H. Use this range to identify the group from an IR spectrum.

Phenol O-H

Phenol O-H absorbs in the IR at 3200-3600 cm⁻¹. Intensity: strong, band shape: Broad. Use this range to identify the group from an IR spectrum.

Primary amine N-H

Primary amine N-H absorbs in the IR at 3300-3500 cm⁻¹. Intensity: medium, band shape: Two peaks (symmetric/asymmetric). Use this range to identify the group from an IR spectrum.

Secondary amine N-H

Secondary amine N-H absorbs in the IR at 3300-3500 cm⁻¹. Intensity: medium, band shape: One peak. Use this range to identify the group from an IR spectrum.

Amide N-H

Amide N-H absorbs in the IR at 3150-3400 cm⁻¹. Intensity: medium, band shape: Broad, may have two peaks. Use this range to identify the group from an IR spectrum.

Study guides

Related study guides

Free, in-depth guides that put this material in context.

IR spectroscopy basicsIdentify functional groupsReading NMR basicsAll guides