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
Quick answer
A band near 3542 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| Hydroxyl (O-H) | 5 | 5 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Possible materials
| Materiale | Picchi di supporto | Overlapping groups | Fonti citate |
|---|---|---|---|
| polypropylene | 3542, 1030, 1600 | Hydroxyl (O-H) | 1 |
| Hydroxyapatite | 3542, 1620, 1639 | Hydroxyl (O-H) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3542 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Letteratura dietro queste assegnazioni
-
affidabilità 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) affidabilità 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) affidabilità 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) affidabilità 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) affidabilità 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) affidabilità 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
Hai uno spettro con questa banda?
Carica il tuo spettro FTIR e ottieni un report di interpretazione completo — assegnazioni di picchi con citazioni bibliografiche, corrispondenze con librerie e una catena di prove con valutazione di affidabilità — in secondi.