What absorbs at 3542 cm⁻¹ in an FTIR spectrum?
A band near 3542 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) | 5 | 5 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
confidence 1.0
“L¢ cm-1 BR (43), returns to a weaker state in , as judged by both of the intensity of the intense negative band at 3549 CdN N-H L¢ the frequencies of the stretching and bending by half with the remaining band now absorbing at 3542 cm-1 vibr”
Maeda 等 - 1999 - Chromophore-protein-water interactions in the L in DOI: 10.1021/bi9907072 -
Hydroxyl (O-H) confidence 1.0
“First, the polymers P1 and P4 showed a stretch peak (around 1736 After the -C=O dehydration reaction, the ester group changed into a hydroxyl group, with the loss of the stretch cm-1 cm-1 -C=O peak and a new -OH stretch peak (3542 for polym”
Chen 等 - 2019 - Simple Route to Synthesize Fully Conjugated Ladder DOI: 10.3390/polym11101619 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Karami 等 - 2020 - Kinetics of Cross-Linking Reaction of Epoxy Resin DOI: 10.3390/polym12051157 -
Hydroxyl (O-H) confidence 1.0
“3287 3285 [m 3489 3486 Stretching of water (O-H)] s 3542 3542 (a) (b)”
Effect of preparation conditions on the nanostructure of hydroxyapatite and brushite phases DOI: 10.1007/s13204-015-0509-4 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Song 等 - 2020 - How the hindered amines affect the microstructure DOI: 10.1515/spma-2019-0001 -
Hydroxyl (O-H) confidence 0.9
“Explicit assignment in text: 'νOH Depending on the irradiation wavelength'.”
Kosendiak 等 - 2019 - Complexes of Glycolic Acid with Nitrogen Isolated DOI: 10.3390/molecules24183245
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