What absorbs at 1291 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1291 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 1291 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

• Acetate 신뢰도 1.0

  “Additional bands corresponding to C-O-H bending appeared at 1291 cm-1.”

  Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569
• Amide 신뢰도 1.0

  “Peak at 1291 which also confirms the self-doped structure of the copolycm-1 indicate C N stretching and C H and at 3214 mer as proposed in reaction 1.”

  Dey Sadhu 等 - 2020 - Preparation and characterization of polyanilinea DOI: 10.1002/pc.25738
• Amide 신뢰도 1.0

  “The peak at 1291 was due to C-N stretching vibration and this confirmed the presence of the amine group in pure in the memcm-1 brane matrix.”

  Experimental and DFT studies on the structural and optical properties of chitosan/polyvinyl pyrrolidone/ZnS nanocomposites DOI: 10.1007/s00289-023-04700-0
• Acetate 신뢰도 1.0

  “In addition, a of thermogram which had two melting shifting of the C-O vibration of BA at 1291.40 points at 157.0 and 188.8 °C, respectively, cm-1 to 1379.16 was proof of deprotonation in corresponding to the DES and SA melting”

  Ainurofiq 等 - 2018 - Synthesis, characterization, and stability study o DOI: 10.1080/10837450
• Acetate 신뢰도 1.0

  “In BA, the neutral carboxylic group (-COOH) had a strong carbonyl (C=O) with stretching at a peak of 1686.82 cm-1 and a weak carbonyl (C-O) stretching at 1291.40 cm-1.”

  A Novel Desloratadine-Benzoic Acid Co-Amorphous Solid: Preparation, Characterization, and Stability Evaluation DOI: 10.3390/pharmaceutics10030085
• Fluorine (C-F) 신뢰도 1.0

  “O nline 1300 1300 CF symmetric stretching and rocking 1291 [19] α PVDF 2 L ibrary”

  Chipara 等 - 2020 - Spectroscopic investigations on PVDF-Fe2O3 nanocom DOI: 10.1002/app.48907
• Acetate 신뢰도 1.0

  “The peaks at 1585-1500 cm-1 resulted from the C=C stretching vibrations of the aromatic ring cm-1 C=C at 1585-1500 resulted from the stretching vibrations of the aromatic ring while the peak at while the peak at 1291 cm-1 can be assigned to”

  Kowalczuk - 2020 - FTIR Characterization of the Development of Antimi DOI: 10.3390/coatings10090818
• Alkene (C=C) 신뢰도 1.0

  “The porphyrin peaks at 1494 cm-1 and 1291 cm-1 due to their C=C and C-N stretching can also be seen in the GO@AuNRs-TMePyP spectrum.”

  Graphene Oxide-Gold Nanorods Nanocomposite-Porphyrin Conjugate as Promising Tool for Cancer Phototherapy Performance DOI: 10.3390/ph14121295