What absorbs at 3850 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 3850 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 3 cited sources
Quick answer
A band near 3850 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) | 3 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| S s | 1 | 1 | 1,0 |
| Hydrogen bond | 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 |
|---|---|---|---|
| graphene oxide | 3850, 1150, 3400 | Hydroxyl (O-H), Alkyl C-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 3850 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
“The peaks at 3850, 3418, 2923, 1540.5, cm-1 and 1081.6 were attributed to O-H stretching of intra molecular hydrogen bonds, C phenolic groups, and C-N stretching vibrations of aliphatic and aromatic amines.”
Divya 等 - 2018 - Biopolymer gelatin-coated zinc oxide nanoparticles DOI: 10.1016/j.jphotobiol.2017.11.008 -
S s confianza 1,0
“LLM confirmed rule peak-group candidate”
Adsorption characteristics of sulfur solution by acticarbon against drinking-water toxicosis DOI: 10.1016/j.sjbs.2016.09.010 -
confianza 1,0
“cm-1 cm-1 In the GO-Ag spectrum, the peaks at 3850 and at 3733 can be assigned In the GO-Ag spectrum, the peaks at 3850 cm-1 and at 3733 cm-1 can be assigned to to the absorbed water due the stretching vibration of O-H group of carboxyl, al”
Synthesis and Characterization of Some Graphene Oxide Powders Used as Additives in Hydraulic Mortars DOI: 10.3390/app112311330
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