What absorbs at 1177 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1177 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 1177 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

• Fluorine (C-F) 信頼度 1.0

  “On the which can be attributable to and stretching viν other hand, brationalmodes,respectively, in 70wt.%PVdF-HFP-30 wt.%LiCF a(CF 2) band originating from PVdF-HFP was found at 3SO 3, 1176cm-1,1177 cm-1and1178cm-1inS30,6ECand6PCsamples.”

  Characteristics of PEMA/PVdF-HFP blend polymeric gel films incorporated with lithium triflate salt in electrochromic device DOI: 10.1016/j.ssi.2011.11.035
• Phosphate (PO4) 信頼度 1.0

  “The P=O stretching at 1177 and 1184”

  Verma 等 - 2018 - Structural investigations on uranium(VI) and thori DOI: 10.1039/C7NJ04460G.
• Alkyl C-H 信頼度 1.0

  “The main absorption peaks were cm-1, Additionally, some additional peaks were recorded at 1454 and 1381 due to the asymmetric observed at 3020 and 2943 cm-1, 1743 cm-1 and 1177 cm-1 due to CH stretching of methyl and methylene cm-1 and symm”

  Eleftheriadou 等 - 2020 - Development of Novel Polymer Supported Nanocomposi DOI: 10.3390/app10072368
• Ester 信頼度 1.0

  “However, it is very difficult to determine the degree of esterification due to the presence Materials2022,15,470 8of13 and 1177 cm-1, a peak is formed of ester bonds in the polyester.”

  Grgac 等 - 2022 - The Effect of Ultrasonic Treatment on the Binding DOI: 10.3390/ma15020470
• 信頼度 1.0

  “Moreover, asymmetric S O stretching 2 cm-1, cm-1, = at 1355 and symmetric S O stretching at 1177 were observed in the FTIR spectra 2 of tosylated cellulose, which confirmed the tosylation reaction.”

  A Composite Anion Conducting Membrane Based on Quaternized Cellulose and Poly(Phenylene Oxide) for Alkaline Fuel Cell Applications DOI: 10.3390/polym12112676
• Acetate 信頼度 1.0

  “cm-1 1177 C-O-C stretch bands were found near 1016 The band near 754 work [25].”

  Tannic Acid-Loaded Hydroxyapatite Carriers for Corrosion Protection of Polyolefin-Coated Carbon Steel DOI: 10.3390/app122010263
• Fluorine (C-F) 信頼度 1.0

  “cm-1 Similarly, this shifting exists in the new band displayed as a broad band at 1177 cm-1 v within the first 50 s that grows and stabilizes at 1170 corresponding to the s(CF 2) +”

  Torres-Rodriguez 等 - 2022 - Polyvinylidene Fluoride Aerogels with Tailorable C DOI: 10.3390/gels8110727
• 信頼度 0.9

  “Absorbance band at about 1177 cm-1 (C-O).”

  Volatile out gassing characteristics of highly filled ethylene vinyl acetate binder materials: Gas phase infra-red spectroscopy DOI: 10.1016/j.polymertesting.2012.12.001