What absorbs at 1317 cm⁻¹ in an FTIR spectrum?
A band near 1317 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 1317 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 | 9 | 9 | 1.0 |
| Methoxy (OCH3) | 6 | 6 | 1.0 |
| Methacrylate | 6 | 6 | 1.0 |
| C-O single bond | 6 | 6 | 1.0 |
| Acetate | 6 | 6 | 1.0 |
| Carbohydrate | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Aromatic ring | 3 | 3 | 1.0 |
| Methyl | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Protein beta turn | 1 | 1 | 1.0 |
| Protein alpha helix | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Nitro (NO2) | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 0.7 |
| Oxalate | 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 |
|---|---|---|---|
| chitosan | 1317, 1650, 1655 | Alkyl C-H, Methacrylate, C-O single bond | 2 |
| curcumin | 1317, 1063, 1153 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| copper oxide nanoparticles | 1317, 624, 1384 | 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 1317 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
-
Acetate confidence 1.0
“From this it can be cm-1, by the band around 1317 which is typically associated observed that sample LILC-26-4-S had prominent signals at C-O with the stretching of the S unit ring.”
Bryant 等 - 2023 - Variable lignin structure revealed in Populus leav DOI: 10.1039/d3ra03142j -
Aromatic ring confidence 1.0
“dpa172d1_B DPA is characterized by bands with maxima at ~691-744 cm-1, 876 cm-1, 1173 cm-1, 1242 dpa173d1_B vibrational modes: the out-of-plane deformation of the benzene ring, deformation of the dpa174d1_B cm-1, 1317 cm-1, 1415 cm-1, 1456-”
The Photoluminescence and Vibrational Properties of Black Phosphorous Sheets Chemically/Electrochemically Functionalized in the Presence of Diphenylamine DOI: 10.3390/polym14214479 -
Alkyl C-H confidence 1.0
“The band at 1317 was assigned as -CH”
Bian 等 - 2021 - Crystalline Structure Analysis of All-cellulose Na DOI: 10.1007/s10570-017-1259-0 -
Alkyl C-H confidence 1.0
“The 1317 cm-1 absorbance peak is attributed to the C-H bending vibration of the aromatic ring in polysaccharides.”
Characterization of Natural Fiber Extracted from Corn (Zea mays L.) Stalk Waste for Sustainable Development DOI: 10.3390/su142416605 -
Amide confidence 1.0
“2 2 cm-1 cm-1 cm-1 cm-1 1317 and 1259 (amide III vibration modes), 1149 and 1060 (C-O-C”
Physicochemical Properties and Functional Characteristics of Ecologically Extracted Shrimp Chitosans with Different Organic Acids during Demineralization Step DOI: 10.3390/molecules27238285 -
Alkyl C-H confidence 1.0
“The 1317 band corresponded to -CH 2 C1-O-C4 in cellulose [31,32].”
Surface Chemical Changes of Sugar Maple Wood Induced by Thermo-Hygromechanical (THM) Treatment DOI: 10.3390/ma12121946 -
Aromatic ring confidence 1.0
“Alkane, aromatic, ketone compounds, pounds, carboxylic acids, and aromatic nitro compounds are attributed to C-H deforBiomimetics 2022, 7, x FOR PEER REVIEW 9 of 19 mation vibration (1317.38 cm-1) and CH3 rocking vibration (1031.92 cm-1).”
Preparation of Novel Nanoformulation to Enhance Efficacy in the Treatment of Cardiovascular Disease DOI: 10.3390/biomimetics7040189 -
Amide confidence 1.0
“cm-1 There was an increase in the frequencies of 1317 and 1018 of C-N stretching of amide III and C-O vibration, respectively.”
Improvement of Chitosan Films Properties by Blending with Cellulose, Honey and Curcumin DOI: 10.3390/polym15122587
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