What absorbs at 1182 cm⁻¹ in an FTIR spectrum?
A band near 1182 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
A band near 1182 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkyl C-H | 7 | 6 | 1.0 |
| C-O single bond | 5 | 5 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| Phosphate (PO4) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
| Sulfate (SO4) | 1 | 1 | 0.8 |
| Silicon-oxygen (Si-O) | 1 | 0 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| PVA | 1182, 1660, 2930 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| Polyester | 1182, 1700, 1250 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 1 |
| GO | 1182, 1720, 1512 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| copper oxide nanoparticles | 1182, 624, 1317 | Alkyl C-H, Methacrylate | 1 |
| PLLA | 1182, 921, 1109 | Alkyl C-H, C-O single bond, Methoxy (OCH3) | 1 |
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 1182 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.
Literature behind these assignments
-
Alkyl C-H confidence 1.0
“which appears in the range of 1465-1382 cm The other (CH 3) group, alkyl side group (CH 2) and main (-CH 2-) cm-1 characteristic peak due to fullerene at 1182 may be chain all merge together and appear as a wide absorption cm-1.”
Katiyar 等 - 2017 - Fullerene (C-60) Containing Cross-Linked Polyacryl DOI: 10.1166/jnn.2017.12880 -
confidence 1.0
“Another oxygen precipitate-related peakatabout1078cm-1 1182cm-1 alsomovedtowardhigh-energyside cipitates appears at 200K [9].”
Ma 等 - 2005 - Infrared studies of the oxygen precipitation in fa DOI: 10.1016/j.mseb.2005.06.005 -
Fluorine (C-F) confidence 1.0
“This band corresponds to the asymmetric stretch ofnew intense band at 1182 This band corresponds to the asymmetric stretch of-CF 2, while the cm-1.”
Terraza 等 - 2018 - Preparation of CuONPs@PVDFNon-Woven Polyester Com DOI: 10.3390/polym10080862 -
Alkyl C-H confidence 1.0
“1182 and 1165 cm-1 C-H the drop generated in continuous inkjet printing mode.”
Printing “Smart” Inks of Redox-Responsive Organometallic Polymers on Microelectrode Arrays for Molecular Sensing DOI: 10.1021/acsami.9b11927 -
Metal oxygen confidence 1.0
“With the incorporation of GO with PVA, the FTIR spectra indicated the formation of common properties such as O-H, C=O, C=C, -CH2, C-O stretching, and C-H bending at 3741.18 cm-1, 1774.84 cm-1, 1689.04 cm-1, 1511.76 cm-1, 1182.03 cm-1, and 8”
Evaluation of Structural and Optical Properties of Graphene Oxide-Polyvinyl Alcohol Thin Film and Its Potential for Pesticide Detection Using an Optical Method DOI: 10.3390/photonics9050300 -
Acetate confidence 1.0
“As shown in Figure 1c, the characteristics of the stretching band for PPO were observed at 2923 (aromatic C-H cm-1 stretching), 1469, and 1600 (aromatic ring stretching), and 1182 (aromatic C-O stretching) [25].”
A Composite Anion Conducting Membrane Based on Quaternized Cellulose and Poly(Phenylene Oxide) for Alkaline Fuel Cell Applications DOI: 10.3390/polym12112676 -
Amide confidence 1.0
“from the stretching vibration of C-N, and the peaks at With other parameters (1.0g DL-malic acid and 200° 1182cm-1 1086cm-1 and from the bending vibration of 0.4mL EDA, C), the impact of reaction time (2h-7h) fluorescenceintensity C-H.”
Li 等 - 2019 - The One-Step Preparation of Green-Emissioned Carbo DOI: 10.1155/2019/8628354 -
Acetate confidence 1.0
“According to the band assignments in FTIR spectra, the 1182 cm-1 band is assigned to ν as(C-O-C) + r as(CH 3), and the bands at cm-1 1133 are the pure band relative to the CH group, r s(CH 3).”
Pandit 等 - 2014 - Influence of Temperature on the Conformational Gui DOI: 10.14429/dsj.64.7329
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