What absorbs at 1110 cm⁻¹ in an FTIR spectrum?
A band near 1110 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 1110 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 | 28 | 26 | 1.0 |
| Methacrylate | 25 | 24 | 1.0 |
| Acetate | 25 | 24 | 1.0 |
| Methoxy (OCH3) | 24 | 23 | 1.0 |
| Hydroxyl (O-H) | 11 | 10 | 1.0 |
| Silicon-oxygen (Si-O) | 9 | 9 | 1.0 |
| Siloxane (Si-O-Si) | 6 | 6 | 1.0 |
| Carbonyl (C=O) | 5 | 5 | 1.0 |
| Aromatic ring | 5 | 4 | 1.0 |
| C c single bond | 4 | 4 | 1.0 |
| Ring structure | 4 | 4 | 1.0 |
| Silicon (Si) | 4 | 4 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Ester | 3 | 3 | 1.0 |
| Carboxyl (COOH) | 3 | 3 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Lignin | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Phosphate (PO4) | 2 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Silicate | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Sulfate (SO4) | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 0.7 |
| Water (H2O) | 1 | 1 | 0.7 |
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 |
|---|---|---|---|
| silica | 1110, 1100, 1080 | Methacrylate, Acetate | 1 |
| gold nanoparticles | 1110, 1638, 3252 | Methacrylate, Acetate | 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 1110 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
-
Silicon (Si) confidence 1.0
“The peaks at 1025 and 1110 cm-1 are attributed to Si-O stretching vibration.”
Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar DOI: 10.3390/cryst11111275 -
Hydroxyl (O-H) confidence 1.0
“The OH stretching peak inito the appearance of band at 1110 4 tially appeared as a shoulder of lower frequency Therefore, the water molecules detected in HClO”
Futamata 等 - 2005 - ATR-SEIR study of anions and water adsorbed on pla DOI: 10.1016/j.susc.2005.06.020 -
confidence 1.0
“Also, a relative sharp peak is appeared at 1110 that can be attributed to Al-C bonds indicating interaction between aluminum ions and carbon element in the”
Ghayempour 和 Montazer - 2018 - A modified microemulsion method for fabrication of DOI: 10.1016/j.ijbiomac.2018.04.037 -
Amide confidence 1.0
“Medium C-N stretching Medium C-N stretching cm-1 1110 Strong C-O stetching aliphatic ether Strong C-O stetching aliphatic ether cm-1 813”
Leemarose 等 - 2021 - Sustainable Synthesis of Gold Nanoparticles and it DOI: 10.13005/ojc/370216 -
Carbonyl (C=O) confidence 1.0
“The magnitude of the 1110 cm-1 ∼1722 band relative to those due to carbonyl groups at suggests that SOZ may, in fact, be the major reaction product.”
McIntire 等 - 2009 - Secondary Ozonide Formation from the Ozone Oxidati DOI: 10.1021/jp901535t -
Amide confidence 1.0
“0.08G0.05 0.35G0.04 0.05G0.01 (1052) (1052) (1051) (1050) C-N/C-C stretch 1110 0.46G0.07 0.48G0.02”
Ngarize 等 - 2005 - A comparative study of heat and high pressure indu DOI: 10.1016/j.foodhyd.2004.12.008 -
confidence 1.0
“The 2 2 cm-1, cm-1 cm-1, bands at approximately 1110 803 and 480 which belonged to the vibrating AC absorption of Si-O-Si group[25], were found in the spectrum of CSiO and RSiO 2.”
Effect of silica resources on the biodegradation behavior of poly (lactic acid) and chemical crosslinked poly (lactic acid) composites DOI: 10.1016/j.polymertesting.2018.08.026 -
Acetate confidence 1.0
“The bands C-O appeared at 1110 cm-1, because of the acetate group improper decomposition [33].”
Synthesis of CuO/ZnO Nanocomposites and Their Application in Photodegradation of Toxic Textile Dye DOI: 10.3390/jcs3030091
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