What absorbs at 3362 cm⁻¹ in an FTIR spectrum?
A band near 3362 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 8 cited sources
Quick answer
A band near 3362 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 6 | 6 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 0.9 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| polysaccharide | 3362, 1637, 1320 | Hydroxyl (O-H), Alkyl C-H, N h | 1 |
| nanocomposite | 3362, 2921, 3300 | Hydroxyl (O-H), Alkyl C-H, N 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 3362 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.
Literature behind these assignments
-
confidence 1.0
“A sharp peak at 802 cm-1 that H stretching vibrations peak was found at 3362 that belongs to the peak of C-Cl stretching.”
Hasanuddin 等 - 2020 - Physicochemical Characterization and Controlled Re DOI: 10.22146/ijc.40921 -
Silicon-oxygen (Si-O) confidence 1.0
“aν isa stretch,sym issymmetrical 700-800 ν(O-Si-O), ν(Si-O-Si) sym sym [18, 20, 28] vibration 3362 S.”
La Vars 等 - 2013 - Si-29{H-1} CP-MAS NMR comparison and ATR-FTIR spec DOI: 10.1007/s00216-013-6746-z -
Alkyl C-H confidence 1.0
“The CH asymmetric stretching band observed 3362 shown in Fig.”
Premalatha 等 - 2017 - Tamarind seed polysaccharide (TSP)-based Li-ion co DOI: 10.1007/s11581-017-1989-x -
Silicon-oxygen (Si-O) confidence 1.0
“5a), collected from the cm(cid:4)1, modified band at 3362sh signaled in clay by organic intercalation figure, eye-shape idol revealed only quartz, pertaining to the substrate,”
Benquerencia (La Serena - Spain) rock art: An integrated spectroscopy analysis with FTIR and Raman DOI: 10.1016/j.heliyon.2019.e02561 -
confidence 1.0
“The band around 3362 can be associated to N-H The next two bands around cm-1”
Controlling the flux of reactive species: a case study on thin film deposition in an aniline/argon plasma DOI: 10.1038/s41598-020-72634-y -
confidence 1.0
“Prominent peaks of ASP and AL at 1402, 1532 and 1645, 3362 cm-1 are modified to 1450, 1580, 1708, and 3420 peaks of unloaded ASP/ALPAA hydro-”
Preparation and In Vitro Evaluation of Aspartic/Alginic Acid Based Semi-Interpenetrating Network Hydrogels for Controlled Release of Ibuprofen DOI: 10.3390/gels7020068 -
Hydroxyl (O-H) confidence 1.0
“The presence of CS on graphene after electrodeposition is shown by the adsorption peak centred at cm-1 3362 (blue line), corresponding most probably to a combination of both O-H and N-H stretching and intermolecular hydrogen bonding within”
Teixeira 等 - 2014 - ChitosanAuNPs Modified Graphene Electrochemical S DOI: 10.1002/elan.201400311 -
Alkyl C-H confidence 1.0
“C-H stretch), and 3362 cm-1”
Tomczynska-Mleko 等 - 2023 - Co-Gelation of Pumpkin-Seed Protein with Egg-White DOI: 10.3390/foods12102030
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