What absorbs at 3190 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 3190 cm⁻¹ puede apuntar a varios grupos funcionales. A continuación se muestran las asignaciones más probables, clasificadas por cuánta evidencia publicada respalda cada una — cada una trazable a literatura (DOI) y validada de forma cruzada con nuestros más de 130,000 espectros de referencia y grafo de conocimiento.
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.
Posibles asignaciones de grupos funcionales
| Grupo funcional | Hechos de respaldo | Fuentes citadas | Confianza máxima |
|---|---|---|---|
| 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 |
La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.
Possible materials
| Material | Supporting peaks | Overlapping groups | Fuentes citadas |
|---|---|---|---|
| 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.
Literatura detrás de estas asignaciones
-
Hydroxyl (O-H) confianza 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 -
confianza 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; -
confianza 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) confianza 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) confianza 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 -
confianza 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 confianza 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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