What absorbs at 3252 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3252 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.

可能性のある官能基アサイン

ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。

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 3252 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.

これらのアサインの根拠となる文献

• Hydroxyl (O-H) 信頼度 1.0

  “In the aqueous mycelium extract (G-Control), the following bands were identified: the broadband at 3251.97 cm-1 corresponds to -OH stretching from alcohol and phenolic indicates the C-H stretching of alkanes;”

  Ganoderma lucidum-Mediated Green Synthesis of Silver Nanoparticles with Antimicrobial Activity DOI: 10.3390/ma16124261
• Alkyl C-H 信頼度 1.0

  “FTIR spectrum showed absorption bands at 3251.75, cm-1, 1718.41, 1618.84, 1275.51, 1260.64, 1207.79, 1042.85, 764.29, and 750.17 which corresponds to 0-H, CH, C=O, and C=C stretching bands that indicate the presence of carboxylic acid, arom”

  Diksha 等 - 2023 - Antibacterial Potential of Gold Nanoparticles Synt DOI: 10.7759/cureus.34830
• Hydroxyl (O-H) 信頼度 1.0

  “Explicit assignment: 'hydroxyl group (3252 -OH)'”

  Bola-amphiphile-imidazole embedded GO membrane with enhanced solvent dehydration properties DOI: 10.1016/j.memsci.2019.117545
• 信頼度 1.0

  “The FTIR spectrum of the pure drug showed the characteristic peaks at 1650.76 due to C=O stretching, at 3364.90 due to O-H stretching, 3252.43 due to N-H stretch, 1435.82 due to C-F stretching,”

  Dissolution Improvement of Atorvastatin Calcium using Modified Locust Bean Gum by the Solid Dispersion Technique DOI: 10.3797/scipharm.1301-23
• 信頼度 0.8

  “Bands widened between 3500 and 3252 referring to striation band.”

  Rutin-Functionalized Multi-Walled Carbon Nanotubes: Molecular Docking, Physicochemistry and Cytotoxicity in Fibroblasts DOI: 10.3390/toxics9080173