What absorbs at 3474 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3474 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.

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 3474 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

• Hydroxyl (O-H) 신뢰도 1.0

  “Both GG1 and GG2 showed its characteristic bands at 3474 cm-1 cm-1 cm-1 and 2950 which is attributed to OH and CH stretching vibration peaks;”

  Ismail 等 - 2017 - Mechanical and Physicochemical Properties Study on DOI: 10.1063/1.5002239
• Hydroxyl (O-H) 신뢰도 1.0

  “For all catalysts, a weak peak, as discussed above, assigned to the stretching vibration of the hydroxyl group of the hemiaminal, appeared at 3487 cm-1, 3491 cm-1, 3474 cm-1, and 3483 cm-1, respectively, after introducing diisopropylamine a”

  Underlying Mechanisms of Reductive Amination on Pd-Catalysts: The Unique Role of Hydroxyl Group in Generating Sterically Hindered Amine DOI: 10.3390/ijms23147621
• Hydroxyl (O-H) 신뢰도 1.0

  “clusters28 A further reduction of the N concentration to 1% results in a The OH stretching spectra of pure B and B cm-1 N-matrices23 loss of intensity of the band at 3474 trapped in are well-known.”

  Oswald 等 - 2017 - Cooperativity in Alcohol-Nitrogen Complexes Under DOI: 10.1021/acs.jpca.7b01265
• Hydroxyl (O-H) 신뢰도 1.0

  “Additionally, the band at 3474 assigned to O-H in sugars, alcohols, and carbohydrates, may prove the biogenic impact to aerosol composition.”

  Popovicheva 等 - 2020 - Functional Factors of Biomass Burning Contribution DOI: 10.3390/atmos11040319