What absorbs at 1100 cm⁻¹ in an FTIR spectrum?
A band near 1100 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
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| C-O single bond | 14 | 12 | 1.0 |
| Siloxane (Si-O-Si) | 12 | 11 | 0.9 |
| Phosphate (PO4) | 10 | 8 | 0.9 |
| Silicon-oxygen (Si-O) | 8 | 6 | 1.0 |
| Carbohydrate | 3 | 3 | 0.9 |
| Hydroxyl (O-H) | 2 | 2 | 0.9 |
| Alkyl C-H | 2 | 2 | 0.8 |
| C n single bond | 2 | 2 | 0.8 |
| Carbonyl (C=O) | 1 | 1 | 0.9 |
| S eq o | 1 | 1 | 0.9 |
| C c single bond | 1 | 1 | 0.9 |
| Sulfate (SO4) | 1 | 1 | 0.9 |
| Boron nitrogen | 1 | 1 | 0.9 |
| Metal hydroxyl | 1 | 1 | 0.8 |
| Phospholipid | 1 | 1 | 0.8 |
| Metal oxygen | 1 | 1 | 0.8 |
| Ester | 1 | 1 | 0.8 |
| Perchlorate | 1 | 0 | 0.9 |
| Aromatic ring | 1 | 0 | 0.7 |
| Carboxyl (COOH) | 1 | 0 | 0.4 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
confidence 1.0
“Broad absorption band between 1100 and 1000 cm-1 corresponds to transverse optical component of asymmetric stretching.”
Pandey 等 - 2016 - Impact of post deposition annealing in O-2 ambient DOI: 10.1016/j.optmat.2014.08.005 -
confidence 1.0
“explicit assignment”
Purhanudin 和 Awang - 2016 - Formation of chemical bonds and morphological stud DOI: 10.1063/1.4966804 -
confidence 1.0
“Explicit assignment in text”
Ducic 等 - 2012 - Phosphorus Compartmentalization on the Cellular Le DOI: 10.1155/2012/374039 -
Silicon-oxygen (Si-O) confidence 1.0
“Explicit assignment in text.”
Froehlich 等 - 2013 - Libyan Desert Glass New field and Fourier transfo DOI: 10.1111/maps.12223 -
C-O single bond confidence 1.0
“Explicit assignment in text”
Gouda 等 - 2022 - Fabrication of Chitosan Nanofibers Containing Some DOI: 10.3390/polym14102094 -
C-O single bond confidence 1.0
“Explicit assignment in text”
Gregorio 等 - 2017 - Analysis of human bodily fluids on superabsorbent DOI: 10.1016/j.talanta.2016.10.061 -
confidence 1.0
“Explicit assignment: 'stronger peaks at 1000-1100 cm-1 to the C-O stretching of primary and secondary'”
Li 等 - 2019 - Enhancement in adsorption potential of microplasti DOI: 10.1016/j.watres.2019.03.069 -
C-O single bond confidence 1.0
“Explicitly assigned as part of ether bonds.”
Lv 等 - 2017 - The Adsorption Capacity of GONsCMCFe3O4 Magnetic DOI: 10.3390/ma10010058
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 confidence-rated evidence chain — in seconds.
Interpret my spectrum