What absorbs at 3626 cm⁻¹ in an FTIR spectrum?
A band near 3626 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 5 cited sources
Quick answer
A band near 3626 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) | 6 | 4 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 0,9 |
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 |
|---|---|---|---|
| activated carbon | 3626, 1575, 1210 | Hydroxyl (O-H) | 1 |
| clay | 3626, 1736, 2855 | Hydroxyl (O-H), Water (H2O) | 1 |
| CS | 3626, 1645, 1720 | 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 3626 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
-
Hydroxyl (O-H) affidabilità 1,0
“be at 3498 and bonding change of Thr204 occurs without evident structural Secondary alcohols possess their O-H stretches at 3626-”
Kandori 等 - 2010 - Protein-Protein Interaction Changes in an Archaeal DOI: 10.1155/2010/424760 -
Hydroxyl (O-H) affidabilità 1,0
“Most of the changes in the spectrum of CuMt compared to the spectrum of the NaMt The characteristic absorption band of NaMt at 3626 cm-1 (Figure 2) is assigned to OH cm-1.”
Effect of Copper and Titanium-Exchanged Montmorillonite Nanostructures on the Packaging Performance of Chitosan/Poly-Vinyl-Alcohol-Based Active Packaging Nanocomposite Films DOI: 10.3390/foods10123038 -
Hydroxyl (O-H) affidabilità 1,0
“LLM confirmed rule peak-group candidate”
Sureshkumar 等 - 2020 - Continuous Phenol Removal Using a Liquid-Solid Cir DOI: 10.3390/en13153839 -
Hydroxyl (O-H) affidabilità 1,0
“The characteristic peak occurring at a frequency level of 3626 cm-1 indicated the O-H stretching in silanol (Si-OH) groups.”
Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism DOI: 10.3390/min7100196 -
Silicate affidabilità 0,9
“absorption bands at 3626 refer to stretching vibration of silicates”
Enhanced Coating Protection of C-Steel Using Polystyrene Clay Nanocomposite Impregnated with Inhibitors DOI: 10.3390/polym15020372
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