What absorbs at 1102 cm⁻¹ in an FTIR spectrum?
A band near 1102 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 1102 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 | 10 | 10 | 1.0 |
| Methoxy (OCH3) | 9 | 9 | 1.0 |
| Methacrylate | 9 | 9 | 1.0 |
| Acetate | 9 | 9 | 1.0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| N h | 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 |
|---|---|---|---|
| chitosan | 1102, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 2 |
| lignin | 1102, 1035, 1510 | Methacrylate, Acetate, C-O single bond | 1 |
| montmorillonite | 1102, 1637, 523 | Methacrylate, Acetate | 1 |
| gelatin | 1102, 1652, 3300 | Methacrylate, Acetate, 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 1102 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
-
confidence 1.0
“1113 Si-O stretching, out-of-plane 1102 1102 2014 1041”
Hayati-Ashtiani - 2012 - Use of FTIR Spectroscopy in the Characterization o DOI: 10.1080/02726351.2011.615895 -
Acetate confidence 1.0
“The absorption peak 1102 and 1022 attributed to C-O stretching and peak at 895 cm-1 cm-1 was due to N-H rocking band.”
Jaiswal 和 Dhayal - 2020 - Preparation of 2D coatings of functionally graded DOI: 10.1016/j.matchemphys.2020.122663 -
confidence 1.0
“Rudolph Erasmus and 1102cm-1 Si-O-Si are assigned to The peaks appearing at 473 and Prof.”
Growth of silicon carbide nanorods from the hybrid of lignin and polysiloxane using sol-gel process and polymer blend technique DOI: 10.1016/j.matlet.2009.08.029 -
Acetate confidence 1.0
“The is an cm(cid:0) 1 band at 1048 overlapped of functional groups of fruit protein, polysaccharides such as refers to C-O stretch in sucrose and the band at 1102 cm(cid:0) 1 is C-O and C-C stretch and C-O-H bending in glucose (Bureau et al”
Chemical versus infrared spectroscopic measurements of quality attributes of sun or oven dried fruit leathers from apple, plum and apple-plum mixture DOI: 10.1016/j.lwt.2021.112420 -
Acetate confidence 1.0
“The peak at 1102 is attributed to C-O-C stretching vibration of cellulose [17].”
Salem 等 - 2017 - Study of the effect of surface treatment of kenaf DOI: 10.1088/1742-6596/908/1/012001 -
C c single bond confidence 1.0
“The C-C is k, Fii is the force constant evaluated by the damped least stretching modes are assigned to 1102, 1063, 1054, 996 and square technique, L is the normalized amplitude of the asik”
Samuel 和 Mohan - 2004 - FTIR and FT Raman spectra and analysis of poly(4-m DOI: 10.1016/S1386-1425(03)00212-9 -
Amide confidence 1.0
“The peak at 1102 is due to -C-N stretching mode of vibration, it could be assigned”
Sha 等 - 2017 - High Electrocatalytic Behaviour of Ni Impregnated DOI: 10.1016/j.electacta.2016.12.085 -
Amide confidence 1.0
“1603 1595 1544 1544 1551 NH bend coupled with CN stretch Amide II - - 1453 1438 1446 CH2 bending (scissors) vibration wag of proline and glycine 1378 1386 1378 1378 1394 CH2 Amide III - - 1229 1229 1236 NH bend stretch coupled C-N stretch 1”
Characterization of gelatin/chitosan ploymer films integrated with docosahexaenoic acids fabricated by different methods DOI: 10.1038/s41598-019-44807-x
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a literature-backed analysis — in seconds.