What absorbs at 3336 cm⁻¹ in an FTIR spectrum?
A band near 3336 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 3336 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) | 17 | 16 | 1.0 |
| N h | 7 | 7 | 1.0 |
| Methacrylate | 3 | 2 | 1.0 |
| Acetate | 3 | 2 | 1.0 |
| Alkyl C-H | 3 | 2 | 1.0 |
| Ester | 2 | 1 | 1.0 |
| Methoxy (OCH3) | 2 | 1 | 1.0 |
| C-O single bond | 2 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Nitrile | 1 | 1 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 0 | 1.0 |
| Methyl | 1 | 0 | 1.0 |
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 |
|---|---|---|---|
| ZnO | 3336, 1400, 3430 | Hydroxyl (O-H), Acetate, Methacrylate | 1 |
| silver nanoparticles | 3336, 1636, 1631 | Hydroxyl (O-H), Methacrylate, Acetate | 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 3336 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
-
Hydroxyl (O-H) confidence 1.0
“To extract information from the OH-stretching band, the peak at ~3247 cm-1 and ~3336 cm-1, respectively, separated by the presence of an isosbestic point.”
Hydrating Capabilities of the Biopolymers Produced by the Marine Thermophilic Bacillus horneckiae SBP3 as Evaluated by ATR-FTIR Spectroscopy DOI: 10.3390/ma15175988 -
N h confidence 1.0
“N-H stretching”
A novel study for producing complexed and encapsulated nutrients at nanometric scale to enhance plant growth DOI: 10.1038/s41598-023-37607-x -
confidence 1.0
“The band 3336 is associated with N-H bond of amines, while 1639 is indicative of C=C stretch of alkenes or C=O stretch of carbonyl in amides respectively [39, 44]”
Biogenic Synthesis Of Silver Nanoparticles Using Pod Extract Of Cola Nitida: Antibacterial, Antioxidant Activities And Application As Additive In Paint DOI: 10.1016/j.jtusci.2015.10.010 -
confidence 1.0
“The strong absorption peaks at 1384 1049 and 1076 The cm(cid:3)1 N-H mechanism of the anti-oxidative action of AgNPs may be by the scavband at 3336 was reported to be associated with the bond of cm(cid:3)1”
Olabemiwo 等 - 2020 - The effects on oxidative aging, physical and flow DOI: 10.1016/j.heliyon.2020.e04164 -
Amine primary confidence 1.0
“attributed to primary amine”
Characterization of ultraviolet-photocured acrylamide based polymer DOI: 10.1063/1.4966755 -
confidence 1.0
“Similar ing vibrations and the bands at 3336 and 3258 are formed by N-H in-plane cm-1 observation was made regarding the delta torque (MH-ML), indicating that urea plays an stretching vibrations.”
Potency of Urea-Treated Halloysite Nanotubes for the Simultaneous Boosting of Mechanical Properties and Crystallization of Epoxidized Natural Rubber Composites DOI: 10.3390/polym13183068 -
Hydroxyl (O-H) confidence 1.0
“O-H bond cm-1, O-H bond stretching vibrations are indicated by a wide band at 3336 which denotes stretching vibrations are indicated by a wide band at 3336 cm-1, which denotes the prescm-1 the presence of moisture.”
Rapid Bio-Assisted Synthesis and Magnetic Behavior of Zinc Oxide/Carbon Nanoparticles DOI: 10.3390/cryst13071081 -
Nitrile confidence 1.0
“At higher temperature, the cm-1 occur at 3336, 3273, 714 HCN bands are also recorded in the FTIR spectra at [10, 11].”
Thermal behaviour of antiproliferative active 3-(2-furanyl)-8-aryl-7,8-dihydroimidazo[2,1-c][1,2,4]triazin-4(6H)-ones DOI: 10.1007/s10973-017-6198-3
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