What absorbs at 3169 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3169 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 3169 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

• Amide 신뢰도 1.0

  “Peaks at 3169, 3320, and andasymmetric-CH3 stretchesandthebroadpeaksat30943410cm-1 secondary amide N-H stretches as well as primary amine Ndue to the presence of the secondary amide/NHstretches,andthestrongpeakat1568cm-1 ischaracteristic H”

  Alexander 等 - 2016 - Carboxylation and Decarboxylation of Aluminum Oxid DOI: 10.1155/2016/7950876
• Hydroxyl (O-H) 신뢰도 1.0

  “explicit assignment in text”

  James 等 - 2022 - Synthesis and Characterization of Novel Nano-carbo DOI: 10.15376/biores.17.3.4452-4469
• Carbonyl (C=O) 신뢰도 1.0

  “Moreover, cm(cid:3)1 O-H 1 shows the stretching vibration peak at 3169 assothe theoretical spectrum also reveals the carbonyl peak at ciated with the presence of hydroquinone, while the peak cm(cid:3)1.”

  A comparison of experimental and theoretical studies of benzoquinone modified poly(thiophene): effect of polymerization techniques on the structure and properties DOI: 10.1039/d0ra07714c
• N h 신뢰도 1.0

  “The peaks at 3169 and 1401 were identied as NH stretching and -P=O(O-NH 4+) scissoring vibration, which belonged to the unreacted groups on CADP-cotton.”

  Xu 等 - 2022 - Durable and high-efficiency casein-derived phospho DOI: 10.21203/rs.3.rs-884727/v1