What absorbs at 3390 cm⁻¹ in an FTIR spectrum?
A band near 3390 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 11 | 11 | 0.95 |
| Hydrogen bond | 2 | 2 | 0.8 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 0.85 |
| Phenolic | 1 | 1 | 0.8 |
| Metal hydroxyl | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Water (H2O) confidence 1.0
“Explicit: 'pure water shows a broad absorption band with the peak position at 3390 cm-1'.”
Ashraf 等 - 2021 - Identification and properties of ion-pairs in the DOI: 10.1016/j.molliq.2020.114891 -
Silanol (Si-OH) confidence 1.0
“Part of range 3350-3390 cm-1 assigned to Si-OH”
Osman 和 Sapawe - 2020 - High purity and amorphous silica (SiO2) prepared f DOI: 10.1016/j.matpr.2020.05.299 -
Hydroxyl (O-H) confidence 0.95
“Explicit assignment: -OH stretching vibration”
Zheng 等 - 2012 - Preparation and capacitance performance of Ag-grap DOI: 10.1016/j.jpowsour.2011.11.026 -
Hydroxyl (O-H) confidence 0.9
“Explicit assignment: OH absorption bands at ~3390 cm-1 related to coupled substitutions with Ti3+, Fe3+, Al3+, Mg2+, Fe2+”
Lueder 等 - 2023 - A framework for quantitative in situ evaluation of DOI: 10.5194/ejm-35-243-2023 -
Hydroxyl (O-H) confidence 0.9
“Text: 'at 3390 and 3102 respectively' referring to -OH stretching”
Retnoningtyas 等 - 2022 - Synthesis and Characterization of Methionine-Funct DOI: 10.33263/BRIAC125.58455859 -
Hydroxyl (O-H) confidence 0.9
“Text: 'band around 3,390 is associated with the O-H stretching'”
Varshney 等 - 2020 - Synthesis of mesoporous SnO2NiO nanocomposite usi DOI: 10.1038/s41598-020-67990-8 -
Hydroxyl (O-H) confidence 0.9
“Intense band around 3390 cm-1 corresponding to -OH stretching of alcohol functional groups.”
Choque-Quispe 等 - 2021 - Preparation and Chemical and Physical Characterist DOI: 10.3390/polym13213719 -
Hydroxyl (O-H) confidence 0.9
“Text: '-OH stretching vibration'”
Dai 等 - 2018 - Covalently-functionalized graphene oxide via intro DOI: 10.1039/c8ra01788c
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