What absorbs at 3308 cm⁻¹ in an FTIR spectrum?
A band near 3308 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 6 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 0.95 |
| N h | 2 | 2 | 0.9 |
| Alkyl C-H | 1 | 1 | 0.9 |
| Amide | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 0.95
“Text states 'stretching signal at 3308 represents hydroxyl'.”
Patrignani 和 Gonzalez-Forte - 2021 - Characterisation of melanoidins derived from Brewe DOI: 10.1111/ijfs.14653 -
Hydroxyl (O-H) confidence 0.9
“Explicit assignment in text: 'peak at 3307.92 and O-H group appeared'”
Puspitasari 和 Yazirin - 2020 - Synthesis and Characterization of Fe2O3 Doped Grap DOI: 10.1002/smll.201001555. -
Hydroxyl (O-H) confidence 0.9
“strong infrared band near 3308 observed for O-H”
Dobrucka - 2018 - Synthesis of MgO Nanoparticles Using Artemisia abr DOI: 10.1007/s40995-016-0076-x -
Hydroxyl (O-H) confidence 0.9
“Assigned to O-H and C-H stretching vibration.”
Hasanin 等 - 2022 - Green decoration of graphene oxide Nano sheets wit DOI: 10.1016/j.btre.2022.e00722 -
N h confidence 0.9
“Explicit assignment in text”
Saucedo-Balderas 等 - 2015 - Synthesis, Molecular Structure of Diethyl Phenylen DOI: 10.5935/0103-5053.20140289 -
Amide confidence 0.8
“Same context as above.”
Tu 等 - 2015 - Physico-chemical properties of gelatin from bighea DOI: 10.1007/s13197-013-1239-9
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