What absorbs at 1116 cm⁻¹ in an FTIR spectrum?
A band near 1116 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 1116 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 |
|---|---|---|---|
| C-O single bond | 7 | 6 | 1.0 |
| Methoxy (OCH3) | 5 | 4 | 1.0 |
| Methacrylate | 5 | 4 | 1.0 |
| Acetate | 5 | 4 | 1.0 |
| Silicon-oxygen (Si-O) | 3 | 1 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Phosphate (PO4) | 2 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| Nitrate | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Sulfate (SO4) | 1 | 1 | 0.8 |
| Silicon (Si) | 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 |
|---|---|---|---|
| alginate | 1116, 1100, 1715 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| gelatin | 1116, 1652, 3300 | Methacrylate, Acetate, C-O single bond | 1 |
| ZnS | 1116, 1650, 3369 | Acetate, Methacrylate | 1 |
| chitosan | 1116, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 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 1116 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 stretching frequency of the C-O-C group cm-1, is perceived at 1116 while C-C stretching mode cm-1 is observed ~ 999 which revealed the interaction of Zn1-xInxS nanoparticles and EDTA capping [34].”
In-doped ZnS nanoparticles: structural, morphological, optical and antibacterial properties DOI: 10.1007/s00339-021-04425-9 -
Amide confidence 1.0
“cm(cid:3)1 1100-1400 that represent C-N and NH functional groups 3 of chitosan are combined with two intensive peaks, 1116 and 1416cm(cid:3)1, of LMO.”
Granulation of Li1.33Mn1.67O4 (LMO) through the use of cross-linked chitosan for the effective recovery of Li+ from seawater DOI: 10.1016/j.cej.2013.08.060 -
C-O single bond confidence 1.0
“Ether stretching band was observed at cm(cid:1)1 stations 1 and 3 only at absorption band with wavenumbers 1115.55 and 1117.83 respectively.”
Sreenivasulu 等 - 2017 - Organic matter from benthic foraminifera (Ammonia DOI: 10.1016/j.mex.2017.01.001 -
Acetate confidence 1.0
“It is universally acknowledged that the is obtained in the strongest peak -C-O-Cat 1116 frequency, width, and intensity of these -CH 2vibrations are with increasing molecular weight, suggesting that some very sensitive to the intermolecular”
Yang 等 - 2015 - Effect of molecular weight on conformational chang DOI: 10.1007/s10853-014-8714-1 -
Acetate confidence 1.0
“It also exhibited C-O-C stretching at 1116 The spectrum of SSD showed 280”
Boateng 等 - 2015 - Composite alginate and gelatin based bio-polymeric DOI: 10.1016/j.ijbiomac.2015.04.048. -
Phosphate (PO4) confidence 1.0
“cm-1 Peaks at ~1072 and ~1116 were assigned to P-O-C modes from phosphodiester groups Peaks at ~1072 and ~1116 cm-1 were assigned to P-O-C modes from phosphodiester groups in nucleic acids.”
Detection of Human Cholangiocarcinoma Markers in Serum Using Infrared Spectroscopy DOI: 10.3390/cancers13205109 -
Alkyl C-H confidence 1.0
“medium intensity peaks at 1419, cm-1 cm-1 1376, shoulder at 1340 for C-H bending vibrations, 1116 and 1094 and 925 and cm-1 cm-1 898 for the pyranose ring.”
Gabriela Chuc-Gamboa 等 - 2021 - Antibacterial Behavior of Chitosan-Sodium Hyaluron DOI: 10.3390/app1103 -
Ester confidence 1.0
“Acknowledgements cm(cid:3)1, cm(cid:3)1 cm(cid:3)1 The peaks at 1116 1098 and 1023 were all due to C(cid:3)(cid:3)O the ester bond in the triglyceride.”
Novel phase change materials for thermal energy storage: Evaluation of tropical tree fruit oils DOI: 10.1016/j.btre.2019.e00359
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