What absorbs at 1139 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1139 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.

可能性のある官能基アサイン

ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。

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 1139 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.

これらのアサインの根拠となる文献

• Acetate 信頼度 1.0

  “The membrane-vehicle numbers as the proportion of water in the cosolvent increased coefficient partition (K) calculated using eq 4: C-O (Figure 1c) as did the stretching motion of PG at 1139”

  Benaouda 等 - 2012 - Discriminating the Molecular Identity and Function DOI: 10.1021/mp300127f
• C c single bond 信頼度 1.0

  “Meanwhile, the peaks at around 1139 and cm-1 726 corresponded to C-C-O asymmetric stretching and C-O symmetric stretching, cm-1.”

  Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569
• Carbohydrate 信頼度 1.0

  “Zoomed in fingerprint region showing carbohydrate specific peaks at carbohydrates (1200 cm-1, cm-1, cm-1 1139cm-1.”

  Dhaulaniya 等 - 2020 - Development of an FTIR based chemometric model for DOI: 10.1080/19440049.2020.1718774
• Acetate 信頼度 1.0

  “(Figure 2B), which can be assigned to the C=O stretching in aliphatic and aromatic ester 1725 cm-1 (Figure 2B), which can be assigned to the C=O stretching in aliphatic and cm-1 groups, the peak at 1164 (Figure 2C), corresponding to the C-O”

  Cutinase-Catalyzed Polyester-Polyurethane Degradation: Elucidation of the Hydrolysis Mechanism DOI: 10.3390/polym14030411
• Alkyl C-H 信頼度 1.0

  “The 3 cm-1, cm-1 other bands were observed at 1139 and 990 attributed to the -CH twisting.”

  Carrier mechanism of ZnO nanoparticles-embedded PMMA nanocomposite organic bistable memory device DOI: 10.1016/j.solidstatesciences.2019.106046
• Alkyl C-H 信頼度 1.0

  “1113cm-1 and1149cm-1 areherebyassignedto1139cm-1 According to DFT calculations, there are 14 C-H stretchand 1164cm-1 ing vibrations in different combinations between 3000 and , respectively, according to Table 1 and relative PED”

  Ullah 等 - 2016 - Fourier Transform Infrared Spectroscopy of Bisphe DOI: 10.1155/2016/2073613
• Silicon (Si) 信頼度 1.0

  “cm-1 1200-400 The peaks at 1139.24 and 1095.99 are assigned to stretching cm-1 cm-1 vibration of Si-O, the peaks at 1031.25 and 1008.16 are assigned to stretching cm-1 cm-1 vibration of Si(Al)-O, the peaks at 787.56 and 761.71 are assigned”

  Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110
• Amide 信頼度 1.0

  “When comparing in cellulose can be intensity patterns at cm(cid:3)1, 'Days 8-11' with alterations in the protein regions manifests 1054 which displays a reduction over time, and cm(cid:3)1 across all three approaches with the amide III peak”

  Application of vibrational spectroscopy techniques to non-destructively monitor plant health and development DOI: 10.1039/c5ay00377f