What absorbs at 1278 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1278 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 1278 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

  “The O-H and C-O-C cm-1, stretching vibrations produce peaks at 1278 and 1095 respectively [44].”

  Formulation and Characterization of Fe3O4@PEG Nanoparticles Loaded Sorafenib; Molecular Studies and Evaluation of Cytotoxicity in Liver Cancer Cell Lines DOI: 10.3390/polym15040971
• Alkyl C-H 신뢰도 1.0

  “The main characteristic bands at 1278 cm-1 correspond to the -CH group”

  Influence of Electrospinning Parameters on Fiber Diameter and Mechanical Properties of Poly(3-Hydroxybutyrate) (PHB) and Polyanilines (PANI) Blends DOI: 10.3390/polym8030097
• Acetate 신뢰도 1.0

  “618 cm-1 cm-1 vibrations), 1509 (C=O and C=C vibrations), 1428 (olefinic C-H bending vibrations), cm-1 cm-1 1278 (aromatic C-O stretching vibrations), 1024 (C-O-C stretching vibrations) [13].”

  Ahmed 等 - 2021 - STRUCTURAL AND OPTICAL CHARACTERISTICS OF POLY(VIN DOI: 10.4314/bcse.v35i3.12
• Hydroxyl (O-H) 신뢰도 1.0

  “In addition, two other cm-1 the nanoparticles in the formulation can be utilized for characteristic bands are observed at 1278 and 1058 O-H C-O-H target the cancer cells by the application of external magwhich belongs to the and stretching”

  Ebadi 等 - 2019 - Synthesis and properties of magnetic nanotheranost DOI: 10.2147/IJN.S214923
• Alkyl C-H 신뢰도 1.0

  “Biomolecules 2021, 11, x FOR PEER REVIEW 4 of 20 the peaks at 1343 cm-1 and 1278 cm-1 to rocking vibration modes of CH2 [48], while the is indicative of the OH deformation asymmetric ring mode vibration peak at 1209 cm-1 Biomolecules2021,11”

  Stabilization of Dry Sucrose Glasses by Four LEA_4 Proteins from Arabidopsis thaliana DOI: 10.3390/biom11050615
• Protein 신뢰도 1.0

  “The centroid spectrum corresponding to fibrosis tissue was characterized by absorbance peaks related to vibrational modes of collagen as evidenced by the peaks at 1174 cm-1 (C-O stretching) [34], 1202 cm-1, 1230 cm-1, 1278 cm-1, 1304 cm-1 (”

  Moreau 等 - 2020 - Analysis of Hepatic Fibrosis Characteristics in Ci DOI: 10.3390/molecules25184092
• Acetate 신뢰도 1.0

  “The CH asymmetric and symmetric deformation was observed at 1452 and 3 cm-1 cm-1, cm-1, 1379 respectively, whilst C-O-C stretching was observed at 1278 1224”

  Development of an Electrospun Patch Platform Technology for the Delivery of Carvedilol in the Oral Mucosa DOI: 10.3390/nano12030438
• Acetate 신뢰도 1.0

  “The most pronounced chemical groups of PHB correspond to the peaks at 1721 cm-1 (C=O group), 1052 cm-1 (C-O-C group), 1278 cm-1 (CH group), and 3000-2700 cm-1 (-C-H”

  Development of Nonwoven Fibrous Materials Based on Poly-3-Hydroxybutyrate with a High Content of -Tricalcium Phosphate DOI: 10.3390/polym15153167