What absorbs at 3190 cm⁻¹ in an FTIR spectrum?
A band near 3190 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 7 cited sources
Quick answer
A band near 3190 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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| N h | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Amine primary | 2 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 0,9 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Possible materials
| Material | Stödjande toppar | Overlapping groups | Citerade källor |
|---|---|---|---|
| polyethylene | 3190, 1737, 1720 | Hydroxyl (O-H) | 1 |
| polypropylene | 3190, 1030, 1600 | 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 3190 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.
Litteratur bakom dessa identifieringar
-
Hydroxyl (O-H) förtroende 1,0
“2876 CH3 Symmetric stretching 2839 CH2 Symmetric stretching 3190 OH Stretching vibration”
Modification of surface characteristic and tribo-electric properties of polymers by DBD plasma in atmospheric air DOI: 10.1051/epjap/2017170149 -
förtroende 1,0
“3330 3416 N-H(secondaryamine) Stretching 3190 3190 C-H (aliphatic)”
Merline 等 - 2013 - Melamine formaldehyde curing studies and reaction DOI: 10.1038/pj.2012.162; -
förtroende 1,0
“The absorbance peaks at 3190 cm-1 and 2834 cm-1 corresponded to N-H functional groups of primary amine in proteins, while the peak at 1531 cm-1 corresponded to C=N stretchPharmaceutics2021,13,511 5of15 ing vibration due to secondary amide i”
Endophytic Bacteria Enterobacter hormaechei Fabricated Silver Nanoparticles and Their Antimicrobial Activity DOI: 10.3390/pharmaceutics13040511 -
Hydroxyl (O-H) förtroende 1,0
“first cm-1 weight loss The weight step (30.5%) occurs from bands at 3190.38 represent -OH stretching, while those at”
Sulaimon 等 - 2023 - Quantitative and qualitative analyses of grafted o DOI: 10.3389/fchem.2023.1129673 -
Carbonyl (C=O) förtroende 0,9
“Explicit assignment: 'absorption band at 3190cm-1 due to the typical carbonyl'”
Azli 等 - 2015 - Conductivity and Dielectric Studies of Lithium Tri DOI: 10.1155/2015/145735 -
förtroende 0,9
“Explicit assignment: amide bands at 3416, 3340, 3190 cm-1 (amide II, N-H stretching)”
Mature Landfill Leachate as a Medium for Hydrodynamic Cavitation of Brewery Spent Grain DOI: 10.3390/en14041150 -
N h förtroende 0,7
“assigned to NH stretching”
Marugan 等 - 2023 - Allantoin-zinc layered simple hydroxide biohybrid DOI: 10.1016/j.clay.2023.107002
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