What absorbs at 3419 cm⁻¹ in an FTIR spectrum?
A band near 3419 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 3419 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) | 15 | 13 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Hydrogen bond | 2 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Carbohydrate | 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 |
|---|---|---|---|
| MWCNT | 3419, 2876, 1430 | Hydroxyl (O-H), Methacrylate, 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 3419 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
“The N-H stretching is shifted from to 3419 and these”
Highly Biological Active Antibiofilm, Anticancer and Osteoblast Adhesion Efficacy from MWCNT/PPy/Pd nanocomposite DOI: 10.1016/j.apsusc.2017.10.142 -
Hydroxyl (O-H) confidence 1.0
“Al2+ cm-1 plan due to the doping at large vacancy B - sites of the Nd 2O 3, 941 is due to the cm-1 octahedral Nd - O stretching vibration in plane and 3419 is due to the O - H bending of C Al2+:Nd water molecules [22].”
Antistatic and Dielectric properties of one-dimensional Al2+:Nd2O3 nanowire doped polyaniline nanocomposites for electronic application DOI: 10.1016/j.sna.2018.07.018 -
Alkyl C-H confidence 1.0
“LLM confirmed rule peak-group candidate”
Improvement of the textural characteristics of curdlan gel by the formation of hydrogen bonds with erythritol DOI: 10.1016/j.foodhyd.2021.106648 -
Hydroxyl (O-H) confidence 1.0
“Two bands were displayed in the spectra: cm-1 the 3419 one, related to the stretching of OH bonds, and cm-1 the 1644 band, related to the deformation of the OH bonds13.”
Figueiredo dos Santos 等 - 2016 - Oxidative desulfurization of thiophene on TiO2ZSM DOI: 10.1590/1980-5373-MR-2015-0130 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Curing Kinetics Modeling of Epoxy Modified by Fully Vulcanized Elastomer Nanoparticles Using Rheometry Method DOI: 10.3390/molecules27092870 -
confidence 1.0
“cm-1 cm-1 sparfloxacin) there are bands characteristic of sparfloxacin, which definitely confirms its presence: at 3419 and 3295 associated with N-H asymmetric and symmetric stretching vibrations, the The intense bands at 3419 cm-1 and 3295”
Application of FTIR Method for the Assessment of Immobilization of Active Substances in the Matrix of Biomedical Materials DOI: 10.3390/ma12182972 -
Hydroxyl (O-H) confidence 1.0
“cm-1 in the region 1000-4000 The band at 3419 is attributed to -OH group [18].”
A Sustainable Approach to Fabricating Ag Nanoparticles/PVA Hybrid Nanofiber and Its Catalytic Activity DOI: 10.3390/nano5021124 -
Hydroxyl (O-H) confidence 1.0
“zeolite RHO particles reported by O-H stretching of adsorbed water molecules and O-H bending of cm-1 cm-1 lattice water were appeared as weak peaks at the frequency of 3419 and 1634 respectively.”
Zeolite RHO Synthesis Accelerated by Ultrasonic Irradiation Treatment DOI: 10.1038/s41598-019-51460-x
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