What absorbs at 3262 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3262 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.

Possible functional-group assignments

Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.

Possible materials

Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.

Spectrum logic

This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3262 cm⁻¹ is usually not enough for material identification by itself.

Real-world usage

This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.

Common mistakes

• Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
• Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
• Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.

Verification advice

When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.

Literature behind these assignments

• Hydroxyl (O-H) confidence 1.0

  “Additionally, the wider cm-1 peak at 3262 of the NH and OH groups stretching vibrations, moved to a lower 2 value, which indicates and confirms the chemical interaction between ZnO molecules and the binding sites of chitosan.”

  Bio-Based (Chitosan-ZnO) Nanocomposite: Synthesis, Characterization, and Its Use as Recyclable, Ecofriendly Biocatalyst for Synthesis of Thiazoles Tethered Azo Groups DOI: 10.3390/polym14030386
• Hydroxyl (O-H) confidence 1.0

  “[16] found broad bands at cm-1 cm-1, 3262 and 3247 attributed to hydroxyl groups being this broadening related cm-1 to their chemical reaction, which was proved also by the 1639 imide formation.”

  Gabriela Chuc-Gamboa 等 - 2021 - Antibacterial Behavior of Chitosan-Sodium Hyaluron DOI: 10.3390/app1103
• Hydroxyl (O-H) confidence 1.0

  “VibrationalModes Pure PVA Vibrational Modes PVA:CS Vibrational Modes Pure CS O-H stretching 3259.34 O-H stretching 3261.67 O-H stretching”

  Development of Flexible Plasticized Ion Conducting Polymer Blend Electrolytes Based on Polyvinyl Alcohol (PVA): Chitosan (CS) with High Ion Transport Parameters Close to Gel Based Electrolytes DOI: 10.3390/gels
• N h confidence 0.9

  “Amide A band assigned to N-H stretching.”

  Gaidau 等 - 2021 - Wool Keratin Hydrolysates for Bioactive Additives DOI: 10.3390/ma14164696
• N h confidence 0.9

  “Text: 'at 3262.04 ... for the N-H stretching bands of the secondary amine group'”

  {Enhancement of the dissolution profile of the diuretic hydrochlorothiazide by elaboration of microspheres} DOI: 10.2298/JSC171112065LA