What absorbs at 3372 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3372 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.

가능한 작용기 할당

순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.

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 3372 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.

이 할당의 배경이 되는 문헌

• Hydrogen bond 신뢰도 1.0

  “cm-1 indicating the alcoholic and phenolic OHBoth spectra of N-EFB and Gly-EFB have peaks at 3372 and 3332 groups related to hydrogen bond [23].”

  Hassan 和 Badri - 2014 - Lignin Recovery from Alkaline Hydrolysis and Glyce DOI: 10.1063/1.4895236
• N h 신뢰도 1.0

  “two Gaussians peaks at 3400 and 3372 cm-1 were assigned Compared with the spectra of the condensed phase, two bands at 3400 and 3372 to hydrogen-bonded NH stretching vibrations of larger clusters having liquid-like and solid-like (cid:3)DOI”

  Matsumoto 和 Honma - 2007 - NH stretching vibrations of pyrrole clusters studi DOI: 10.1063/1.2790894
• Hydroxyl (O-H) 신뢰도 1.0

  “LLM confirmed rule peak-group candidate”

  High-Molecular-Weight Exopolysaccharides Production from Tuber borchii Cultivated by Submerged Fermentation DOI: 10.3390/ijms24054875
• N h 신뢰도 1.0

  “Theband at3372 in OLA sample is attributed to the asymmetric and symmetric stretching from primary NH group [4].”

  CZTSxSe1−x nanocrystals_ Composition dependent method of preparation, morphological characterization and cyclic voltammetry data analysis DOI: 10.1016/j.solmat.2016.06.030
• Silanol (Si-OH) 신뢰도 1.0

  “LLM confirmed rule peak-group candidate”

  Effect of Modified Silica Fume Using MPTMS for the Enhanced EPDM Foam Insulation DOI: 10.3390/polym13172996
• 신뢰도 1.0

  “Chromatogram of FTIR showed that the protein concentrate of m b e at1658.78cm-1, 3371.57cm-1, N-H stretching at and nyamplung has a group as a characterize of amide are C=O stretching r 2 0 at1543.05cm-1.”

  Yanti 等 - 2016 - Novel Source of Protein Extract from Nyamplung (Ca DOI: 10.1063/1.4958510