What absorbs at 1716 cm⁻¹ in an FTIR spectrum?
A band near 1716 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 1716 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 |
|---|---|---|---|
| Carbonyl (C=O) | 33 | 28 | 1.0 |
| Carboxyl (COOH) | 17 | 17 | 1.0 |
| Ester | 16 | 16 | 1.0 |
| Methacrylate | 15 | 15 | 1.0 |
| Ketone | 15 | 15 | 1.0 |
| Amide | 15 | 15 | 1.0 |
| Acetate | 15 | 15 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Secondary amine | 2 | 1 | 1.0 |
| N h | 2 | 1 | 1.0 |
| Alkyl C-H | 2 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Protein beta sheet | 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 nanocrystals | 1716, 1110, 1640 | Methacrylate, Carbonyl (C=O) | 1 |
| proteins | 1716, 1735, 1270 | Methacrylate, Carbonyl (C=O) | 1 |
| silver nanoparticles | 1716, 1636, 1631 | 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 1716 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
“The C=O vibration cm-1 bands were observed near 1716 (Liu et al., 2018;”
Ibrahim 等 - 2023 - Role of ammonium phosphate in improving the physic DOI: 10.37190/ppmp/161510 -
Carbonyl (C=O) confidence 1.0
“The observed peak Oxygen permeability 1716cm(cid:3)1 corresponds to the stretching of the carbonyl and in FTIR spectra for both samples at ESR carboxylicgroupswhicharisefromthereactionofoxygenwiththefreeradicalsproducedinthepolymer FTIR mat”
Influence of high doses γ-irradiation on oxygen permeability of linear low-density polyethylene and cast polypropylene films DOI: 10.1016/j.radphyschem.2013.12.005 -
confidence 1.0
“Calibration peak for hexanoic acid.”
Li 等 - 2018 - Novel method based on fourier transform infrared s DOI: 10.1080/10942912.2017.1381113 -
Carbonyl (C=O) confidence 1.0
“The FTIR cm-1, which were spectroscopy of all composite salts demonstrated the peaks at 1716 and 1556 attributed to the carbonyl stretching of carboxyl and carboxylate groups, respectively.”
Meenabun 等 - 2010 - Effect of 2-Amino 2-methyl 1,3 propanediol on Ente DOI: 10.4028/www.scientific.net/AMR.93-94.467 -
Acetate confidence 1.0
“of cm-1 cm-1 and 1716 (C=O stretch, alkyl and alkaline groups.”
Pathak 等 - 2020 - Attenuation of hepatic and breast cancer cells by DOI: 10.1016/j.bcab.2020.101863 -
Acetate confidence 1.0
“From FTIR analysis, two peaks at 1716 and 1207 represent C=O stretching and C-O stretching, respectively-disappeared in the spectra after the alkaline and bleaching treatments indicated that hemicellulose and lignin were almost entirely dis”
Extraction and Characterization of Cellulose Nanocrystals from Tea Leaf Waste Fibers DOI: 10.3390/polym9110588 -
Amide confidence 1.0
“cm(cid:1)1), cm(cid:1)1 during and four negative cross-peaks at (1716, 1500 which the amide II band shifted to 1515 cm(cid:1)1), cm(cid:1)1), (1550, 1500”
Investigation on thermallyinduced conformation transition of soy protein film with variabletemperature FTIR spectroscopy DOI: 10.1002/app.35309 -
Ketone confidence 1.0
“LLM confirmed rule peak-group candidate”
Wernle 和 Gilbert - 2005 - Micromechanics of shelf-aged and retrieved UHMWPE DOI: 10.1002/jbm.b.30285
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