What absorbs at 2344 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 2344 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 4 cited sources
Quick answer
A band near 2344 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 |
|---|---|---|---|
| Adsorbed carbon monoxide | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Alkyl C-H | 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 |
|---|---|---|---|
| starch | 2344, 1650, 1540 | Methacrylate, Methoxy (OCH3) | 1 |
| zinc oxide | 2344, 1627, 1638 | Methacrylate, Carboxyl (COOH), Methoxy (OCH3) | 1 |
| zinc oxide nanoparticles | 2344, 1744, 1627 | Methacrylate, Methoxy (OCH3), Carboxyl (COOH) | 1 |
| composite | 2344, 1703, 1295 | Methacrylate, Methoxy (OCH3) | 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 2344 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
-
Alkyl C-H confianza 1,0
“The spectrum of porous graphene nanosheets is represented by the peaks at 809 cm-1, 1636 cm-1, 2344 cm-1 and 3309 cm-1, resulting from C-H bonding, C=C conjugation, C-N band and N-H extending vibrations.”
An Amperometric Acetylcholine Biosensor Based on Co-Immobilization of Enzyme Nanoparticles onto Nanocomposite DOI: 10.3390/bios13030386 -
Acetate confianza 1,0
“The weak cm-1 absorption bands seen between 2344 and 2365 corresponded to C-O stretching, which cm-1 is one of the carboxylic group's distinctive peaks [47].”
Mansour 等 - 2022 - Green Synthesis of Zinc Oxide Nanoparticles Using DOI: 10.3390/ma15155169 -
Adsorbed carbon monoxide confianza 1,0
“The linear molar absorption (ν)andbending(δ) value.Arrowsindicatethespectralrangeof stretching coefficient (ε for the peak 2344) varies only slightly with glass 32(cid:1) diss),[33] vibrations of dissolved carbonates (CO adsorbed carbonates”
Mueller 等 - 2022 - Foaming Species and Trapping Mechanisms in Barium DOI: 10.1002/adem.202100445. -
confianza 0,9
“Explicit assignment in text: 'nitriles (C#N) at 2344'”
Armynah 等 - 2016 - Study of Chloride Ion Transport of Composite by Us DOI: 10.1063/1.4943752
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