What absorbs at 3497 cm⁻¹ in an FTIR spectrum?
A band near 3497 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 4 cited sources
Quick answer
A band near 3497 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 0,9 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
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 3497 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.
Literatūra aiz šiem piešķīrumiem
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Acetate pārliecība 1,0
“N-H C-H, groups, whereas Figure 5c demonstrates characteristic malachite surface NH 2, cm-1, C-O-C C-S C=O, and peaks at approximately 3497, 2996, 2922, 1705 and 1168 respectively, suggesting that (NH 4) 2S was adsorbed on the malachite sur”
Ibrahim 等 - 2022 - Effect of Ammonium Sulfide on Sulfidization Flotat DOI: 10.3390/min12101193 -
Hydroxyl (O-H) pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Maeda 等 - 1999 - Chromophore-protein-water interactions in the L in DOI: 10.1021/bi9907072 -
Hydroxyl (O-H) pārliecība 1,0
“1500 1000 4000 3500 3000 2500 2000 As can be observed in Figure 2 the spectrum shows (cm-1) (b) Wavenumber cm-1 absorption at 3497 corresponding to -OH groups is in agreement with the results of GC-MS, where the β-cyclodextrin (β-CD) Figure”
Pinto Cotrim 等 - 2016 - Preparation of beta-CyclodextrinLatex Dispersion DOI: 10.7569/JRM.2015.634122 -
Chitosan pārliecība 1,0
“As shown in Figure 4c, the characteristic chitosan bands were at 3497”
Optimization of Ultrasound-Assisted Extraction and Encapsulation of Antioxidants from Orange Peels in Alginate-Chitosan Microparticles DOI: 10.3390/antiox11020297
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