What absorbs at 3386 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 3386 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 8 cited sources
Quick answer
A band near 3386 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 7 | 7 | 1,0 |
| N h | 5 | 5 | 1,0 |
| Water (H2O) | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
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 | 3386, 1737, 1720 | Hydroxyl (O-H) | 1 |
| polypropylene | 3386, 1030, 1600 | Hydroxyl (O-H) | 1 |
| PVA | 3386, 1660, 2930 | Hydroxyl (O-H) | 1 |
| ZnO | 3386, 1400, 3430 | Hydroxyl (O-H) | 1 |
| CaO | 3386, 2909, 1839 | Hydroxyl (O-H), Water (H2O) | 1 |
| MgO | 3386, 699, 874 | Hydroxyl (O-H), Secondary amine, 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 3386 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
-
Water (H2O) confianza 1,0
“The absorption peak observed at 3386.01 was assigned to the bending and stretching vibrations of adsorbed water and surface hydroxyl group on ZnO [16].”
Gopinath 等 - 2023 - Mechanical, structural and optical properties of p DOI: 10.15251/JOR.2023.191.23 -
confianza 1,0
“cm-1, (representing the OH of alcohol), 1195 (for the amine functional group), 1503 cm-1 cm-1 cm-1 2574 (peaks corresponding to COOH), 2945 (C-H stretching), 3386 (the cm-1 N-H-, C-H-, and O-H-bond stretching of amines and amides), and 3696”
Antibacterial and Antibiofilm Activity of Ficus carica-Mediated Calcium Oxide (CaONPs) Phyto-Nanoparticles DOI: 10.3390/molecules28145553 -
N h confianza 1,0
“(cm-1) 3386 PANI base NH stretching [20,34,33,42] 3.5.”
Sedenkova 等 - 2006 - In-situ polymerized polyaniline films. Preparation DOI: 10.1016/j.tsf.2006.05.038 -
confianza 1,0
“ann3 900 1.48 N-H stretching 3386 77 1.1”
Ay 和 Aydinli - 2004 - Comparative investigation of hydrogen bonding in s DOI: 10.1016/j.optmat.2003.12.004 -
Hydroxyl (O-H) confianza 1,0
“LLM confirmed rule peak-group candidate”
Fauzi 等 - 2020 - Nanostructured ChitosanMaghemite Composites Thin DOI: 10.3390/polym12071497 -
Hydroxyl (O-H) confianza 1,0
“Bands at 2530 cm-1 are standardly related to calcite mineral (CaO) and cm-1 the last different band at 3386 is related to the -OH groups [31-35] the last different band at 3386 cm-1 is related to the -OH groups [31-35] SIMDIS results (Table”
Direct Polypropylene and Polyethylene Liquefaction in CO2 and N2 Atmospheres Using MgO Light and CaO as Catalysts DOI: 10.3390/ma15030844 -
confianza 1,0
“1 day 2 days 8 days 24-day 48-day Asymmetric N-H stretching 3386”
Khanna 等 - 2010 - In Situ Swelling Behavior of Chitosan-Polygalactur DOI: 10.1155/2010/175264 -
Hydroxyl (O-H) confianza 1,0
“However, a broad peak at 3386 was observed, representing a characteristic peak of OH groups of the absorbed water on the surface of nanoparticles.”
In situ facile green synthesis of Ag–ZnO nanocomposites using Tetradenia riperia leaf extract and its antimicrobial efficacy on water disinfection DOI: 10.1038/s41598-022-19403-1
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