What absorbs at 1314 cm⁻¹ in an FTIR spectrum?
A band near 1314 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 1314 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 | 4 | 4 | 1.0 |
| N h | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Oxalate | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 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 |
|---|---|---|---|
| Cellulose | 1314, 1735, 1650 | Alkyl C-H, Amide | 2 |
| chitosan | 1314, 1650, 1655 | Alkyl C-H, Amide, N h | 1 |
| copper oxide | 1314, 624, 1686 | Alkyl C-H, Amide | 1 |
| Bacterial Cellulose | 1314, 1050, 1631 | Alkyl C-H, Amide | 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 1314 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
-
N-O bond confidence 1.0
“1384 - N-O symmetric stretching 1314 1317”
Effect of Calcination Temperature on Structural, Morphological and Optical Properties of Copper Oxide Nanostructures Derived from Garcinia mangostana L. Leaf Extract DOI: 10.3390/nano12203589 -
Amide confidence 1.0
“absorbance and thus smaller surface areas of the amide III peak (1314 Indeed, a lower 6 maximum absorbance value for the liquid sample was observed, which proved to be statistically significant at p <0.05.”
Depciuch 和 Parlinska-Wojtan - 2018 - Comparing dried and liquid blood serum samples of DOI: 10.1016/j.jpba.2017.11.074 -
Oxalate confidence 1.0
“peaks at 1314 and 1591 IR peaks indicative of inner-sphere adsorbed oxalate are also observed for”
Yoon 等 - 2004 - Adsorption of organic matter at mineralwater inte DOI: 10.1016/j.gca.2004.04.025 -
confidence 1.0
“Explicitly stated: 'methine peaks at 3322 and 1314 cm-1'”
Akhlaq 和 Uroos - 2023 - Evaluating the Impact of Cellulose Extraction via DOI: 10.1021/acsomega.2c08118 -
Alkyl C-H confidence 1.0
“indicating C-O-C ring skeletal vibration, and cm-1 peaks around 1314 indicating CH wagging 2 3.3 Characterization of bacterial cellulose at C-6 were associated with cellulose.”
Akintunde 等 - 2022 - Bacterial Cellulose Production from agricultural R DOI: 10.1080/21655979.2022.2062970 -
Alkyl C-H confidence 1.0
“The bands at 1314 are assigned as -CH wagging at C-6, 2”
Bian 等 - 2021 - Crystalline Structure Analysis of All-cellulose Na DOI: 10.1007/s10570-017-1259-0 -
Hydroxyl (O-H) confidence 1.0
“928 COC stretching 1314 CH and OH wagging 1080 CO stretching”
Application of Vibrational Spectroscopic Techniques in the Study of the Natural Polysaccharides and Their Cross-Linking Process DOI: 10.3390/ijms24032630 -
Amide confidence 1.0
“LLM confirmed rule peak-group candidate”
Quest of Intelligent Research Tools for Rapid Evaluation of Fish Quality: FTIR Spectroscopy and Multispectral Imaging Versus Microbiological Analysis DOI: 10.3390/foods10020264
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