What absorbs at 1367 cm⁻¹ in an FTIR spectrum?
A band near 1367 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 1367 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 | 11 | 6 | 1.0 |
| Methacrylate | 5 | 3 | 1.0 |
| Acetate | 5 | 3 | 1.0 |
| Hydroxyl (O-H) | 4 | 3 | 1.0 |
| Methoxy (OCH3) | 4 | 2 | 1.0 |
| C-O single bond | 3 | 2 | 1.0 |
| Methyl | 3 | 1 | 1.0 |
| Carbohydrate | 3 | 1 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Ester | 2 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Lignin | 1 | 0 | 0.6 |
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 |
|---|---|---|---|
| CeO2 | 1367, 1554, 1630 | Hydroxyl (O-H), Acetate, Methacrylate | 1 |
| bio-based | 1367, 1720, 1740 | Methacrylate, Acetate, Hydroxyl (O-H) | 1 |
| cellulose | 1367, 1735, 1650 | Alkyl C-H, Acetate, Methacrylate | 1 |
| nanocellulose | 1367, 1540, 1646 | Alkyl C-H, Hydroxyl (O-H), Methacrylate | 1 |
| silver nanoparticles | 1367, 1636, 1631 | Hydroxyl (O-H), Alkyl C-H, Methacrylate | 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 1367 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
-
Hydroxyl (O-H) confidence 1.0
“A peak at 1367 is due to the symthe hydroxyl group of oxygen, which is very common in samples COOmetric stretching vibration mode of acetate group.”
Investigation on the structural properties of CeO2 nanofibers via CTAB surfactant DOI: 10.1016/j.matlet.2015.07.099 -
confidence 1.0
“In this study, between untreated and nondifference spectrum of Q A A-/Q spectrum were identified several His bands in the Q heme iron-depleted PS II membranes from spinach showed A cm-1 [15N]His-labeled PS II core by measuring a spectrum us”
Noguchi 等 - 1999 - Hydrogen bonding interaction between the primary q DOI: 10.1021/bi982294v -
Aromatic ring confidence 1.0
“These Raman lines are atFigure 5a-c have maxima at ~415-498 cm-1, 621-825 cm-1, 906-1003 cm-1, 1184 cm-1, 1331 C=N stretching, C=C stretching in the quinoid ring and C-C stretching in the benzene ring, tributed to the vibrational modes caus”
The Photoluminescence and Vibrational Properties of Black Phosphorous Sheets Chemically/Electrochemically Functionalized in the Presence of Diphenylamine DOI: 10.3390/polym14214479 -
Amide confidence 1.0
“indazole C-C and C-N stretch with C-H in-plane bend 1367 1387”
Comprehensive analytical and structural characteristics of methyl 3,3-dimethyl-2-(1-(pent-4-en-1-yl)-1H-indazole-3-carboxamido)butanoate (MDMB-4en-PINACA) DOI: 10.1007/s11419-021-00573-y -
Carboxyl (COOH) confidence 1.0
“There are hints that point to a direct interaction of GA carboxylate groups with silver, specifically the strong weakening cm-1 of the 1687 band in aqueous solution (Figure 5a), attributed to carboxylic acid, and cm-1 the enhancement of the”
Vibrational Study (Raman, SERS, and IR) of Plant Gallnut Polyphenols Related to the Fabrication of Iron Gall Inks DOI: 10.3390/molecules27010279 -
C c single bond confidence 1.0
“C=O stretching (amide II band) at around 1643 cm-1, N-H bending (amide II band) at around 1540 cm´1, cm´1, around 3300 C=O stretching (amide II band) at around 1643 N-H bending (amide II characterized by six important absorption bands: the”
Preparation of Bio-Based Polyamide Elastomer by Using Green Plasticizers DOI: 10.3390/polym8070257 -
Hydroxyl (O-H) confidence 1.0
“3267 2887 1590 1406 1229 1009 , , and The absorption bands at 1367 3249cm-1 3600 3000 2400 1800 1200 600 in the FTIR spectra were due to O-H stretching (cm-1 2895cm-1 ) vibration of alcohol and phenol.”
Jemal 等 - 2017 - Synthesis, Characterization, and Evaluation of the DOI: 10.1155/2017/4213275 -
Alkyl C-H confidence 1.0
“The peaks at 1428 cm-1, 1367 cm-1, and 1334 cm-1 corMaterials2021,14,4128 7of12 respond to CH2 and CH stretching and bending vibrations.”
Effect of Nanocellulose on the Properties of Cottonseed Protein Isolate as a Paper Strength Agent DOI: 10.3390/ma14154128
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