What absorbs at 1106 cm⁻¹ in an FTIR spectrum?
A band near 1106 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 1106 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 | 11 | 10 | 1.0 |
| Methoxy (OCH3) | 10 | 9 | 1.0 |
| Methacrylate | 10 | 9 | 1.0 |
| Acetate | 10 | 9 | 1.0 |
| Silicon-oxygen (Si-O) | 5 | 5 | 1.0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| C c single bond | 3 | 3 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Lignin | 2 | 2 | 1.0 |
| Ester | 2 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| N c o | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
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 1106 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
“cm(cid:2)1, 1040¨1180 Acknowledgments It shows a weak peak at 1106 which is attributed to the stretching vibration of Si-O.”
Baek 等 - 2006 - Structural characterization of beta-SiC nanowires DOI: 10.1016/j.msec.2005.09.083 -
Hydroxyl (O-H) confidence 1.0
“Assignment 2061-1665 C-CH and O-CH stretch 1245 -CO stretch 3700-3000 -OH stretching 1106 C-C -CO stretch 2980-2920”
Hydrating Capabilities of the Biopolymers Produced by the Marine Thermophilic Bacillus horneckiae SBP3 as Evaluated by ATR-FTIR Spectroscopy DOI: 10.3390/ma15175988 -
confidence 1.0
“C-F stretching vibration Si-O-C 1106 1106 Si-O-C stretching vibration Si-O-Si”
Ganie 等 - 2020 - Synthesis and Characterization of a New Surface-Mo DOI: 10.1155/2020/8814260 -
C c single bond confidence 1.0
“aromatic skeletal vibrations 1155 1157 C-O-C stretching or frame vibration in holocellulose 1106 1112 C-C, C-O stretching in holocellulose”
Jin 等 - 2022 - Rapid Identification for the Pterocarpus Bracelet DOI: 10.3390/molecules27154793 -
Carbonyl (C=O) confidence 1.0
“Lastly, the bond at 1106 cm-1, cm-1 to a carbonyl stretching vibration (C=O).”
Effects of Wet and Dry Treatments on Surface Functional Groups and Mechanical Properties of Flax Fiber Composites DOI: 10.3390/coatings13061036 -
Phosphate (PO4) confidence 1.0
“the peak height ratios of 1120 [22-23] and A 1106cm-1/960 cm-1 the peak height ratio of [24] to evaluate acid phosphate substitution into A”
Spevak 等 - 2013 - Fourier Transform Infrared Spectroscopic Imaging P DOI: 10.1007/s00223-013-9695-9. -
N c o confidence 1.0
“cm-1 Meanwhile, the band at 1106 corresponding to the N-C-O stretching vibration of is shifted to a lower cm-1, cm-1 wavenumber of 1016 and 1641 is the absorption”
Cheng 等 - 2022 - Development of a High-Strength and Adhesive Polyac DOI: 10.1021/acsomega.1c06626 -
Lignin confidence 1.0
“cm-1 the bands at 1106 and 1108 were associated with the syringyl structure of the lignin (Jahan et al.”
Chu 等 - 2017 - Depolymerization Characteristics during the Pyroly DOI: 10.1039/C004654J
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