What absorbs at 2349 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 2349 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 2349 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 |
|---|---|---|---|
| Carbon dioxide | 9 | 7 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 0 | 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 |
|---|---|---|---|
| CO | 2349, 1670, 1620 | Methacrylate, Acetate | 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 2349 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
“proportion.19,30 the concentration in equal Consequently, all the (n (n cm(cid:2)1) cm(cid:2)1) band at 2349 and CH band at 3018 at a bulk 3 4 3 quantitative data will be expressed either in ''ppm m'' or in pressure of 1.2 bar.”
Cailteau 等 - 2011 - In situ gas monitoring in clay rocks mathematical DOI: 10.1039/c0ay00622j -
Carbon dioxide confianza 1,0
“Inspection of the list of infrared and Raman active modes for gaseous CO (see Table 56 in Herzberg, 1956) shows that carbon dioxide 2 displays, besides a very strong v antisymmetric stretching at 3 cm-1, cm-1, 2349.3 two infrared active ban”
FTIR microspectroscopy and SIMS study of water-poor cordierite from El Hoyazo, Spain: Application to mineral and melt devolatilization DOI: 10.1016/j.lithos.2009.05.031 -
confianza 1,0
“The band at 2349 was due to O C O stretching concentration increases which may be due to a decrease in oxygen vacancy concentration [44].”
Fabbiyola 等 - 2017 - Optical and magnetic properties of Ni-doped ZnO na DOI: 10.1016/j.jallcom.2016.10.022 -
Carbon dioxide confianza 1,0
“The band at 2349 was due to O=C=O stretchof dye sensitised solar cells were done using Keithley source ing vibrations which confirms the existence of CO while meter (Model No.”
Structural, optical and electrical properties of Ni doped ZnO nanostructures synthesized by solution combustion method DOI: 10.1007/s10854-017-8038-4 -
Carbon dioxide confianza 1,0
“Moreover, the presence of 3 2 and 2349 cm-1 caused by the asymmetric stretch ν3 of the CO2 molecule [41].”
Thermal and Plasma-Assisted CO2 Methanation over Ru/Zeolite: A Mechanistic Study Using In-Situ Operando FTIR DOI: 10.3390/catal13030481 -
Carbon dioxide confianza 1,0
“Results were grouped based on the mass of Carbon dioxide Antisymmetric stretching 2349”
Gordon 和 Sephton - 2016 - Organic Matter Detection on Mars by Pyrolysis-FTIR DOI: 10.1089/ast.2016.1485 -
confianza 1,0
“Explicit assignment: 'peak located at 2349cm-1 corresponding to the anti-symmetric stretch in carbon dioxide'”
Gordon 和 Sephton - 2018 - A Method for Choosing the Best Samples for Mars Sa DOI: 10.1089/ast.2017.1744 -
Water (H2O) confianza 1,0
“For carbon dioxide and water the areas of cm-1 corresponding to the anti-symmetric characteristic peaks were recorded - one located at 2349 cm-1 arising from a stretching mode of water.”
Gordon 和 Sephton - 2016 - Rapid habitability assessment of Mars samples by p DOI: 10.1016/j.pss.2015.11.019
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