FTIR PEAK INTERPRETATION
What absorbs at 3291 cm⁻¹ in an FTIR spectrum?
A band near 3291 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 5 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 0.9 |
| N h | 2 | 2 | 0.9 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 0.9
“Stretching of hydroxyl group.”
Ashri 等 - 2018 - Modified Dioscorea hispida starch-based hydrogels DOI: 10.1016/j.ijbiomac.2017.10.125 -
Hydroxyl (O-H) confidence 0.9
“-OH and -NH groups”
Celekli 等 - 2019 - Adsorption kinetic and isotherms of Reactive Red 1 DOI: 10.1016/j.molstruc.2019.05.106 -
Hydroxyl (O-H) confidence 0.9
“Explicit assignment.”
Mabungela 等 - 2022 - The Adsorption of Copper, Lead Metal Ions, and Met DOI: 10.1155/2022/5787690 -
Hydroxyl (O-H) confidence 0.8
“Text: 'to 3291 cm-1 in 40mg'”
Kumar 等 - 2020 - Structural, optical and conductivity study of hydr DOI: 10.1088/2053-1591/ab691f -
N h confidence 0.8
“Form III peak at 3291 cm-1”
Edkins 等 - 2015 - Conserved hydrogen bonding in tetrahydrocarbazolon DOI: 10.1039/c4cc10453f
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