What absorbs at 1349 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1349 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 1349 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 |
|---|---|---|---|
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Nitro (NO2) | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Borate | 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 |
|---|---|---|---|
| hydroxyapatite | 1349, 1620, 1639 | Alkyl C-H, Methacrylate | 1 |
| polyethylene glycol | 1349, 1030, 1587 | Alkyl C-H, 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 1349 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
“1441 1446 1449 1438 - 1441 aromatic C-C stretching, Deformation of C-H 1349 1342 1353 1346 1373 1355 C-H deformation in Hemicellulose and cellulose - 1248”
Characterization and Thermal Behavior Study of Biomass from Invasive Acacia mangium Species in Brunei Preceding Thermochemical Conversion DOI: 10.3390/su13095249 -
Acetate confianza 1,0
“2 cm-1 cm-1 Bands located at 1349 and 1295 were attributed to C-O asymmetric bending, cm-1 cm-1 whereas peaks at 1093 and 950 correspond to C-O-C stretching.”
Synthesis and Characterization of Polymer-Based Coatings Modified with Bioactive Ceramic and Bovine Serum Albumin DOI: 10.3390/jfb12020021 -
Borate confianza 1,0
“B-O-B bending vibrations of [BO M V (3) M 2(1 X ) cm1 In sample G 1, the band at around 1349 has B V”
Ibrahim 等 - 2014 - Influence of Fe2O3 on the physical, structural and DOI: 10.1007/s40145-014-0107-z -
Acetate confianza 1,0
“With respect to the organic moiety in 1, the resonances at 1557-1464 cm-1 and 1438cm-1 ν ν and 1438-1349 appeared due to as(C O) and as(C-O) stretching vibrations of the acetate ══ [α-P2W17O61]10can be prepared by removal of a [W(VI) O]4+ u”
Ibrahim 等 - 2020 - Synthesis, Characterization, Electrochemistry, Pho DOI: 10.3390/molecules25184229 -
Carboxyl (COOH) confianza 1,0
“Explicit assignment in text: 'formate (1349'”
Metcalfe 等 - 2021 - Advanced spectroscopic analysis and N-15-isotopic DOI: 10.1039/d1an01261d -
Alkyl C-H confianza 1,0
“For the blend samples, the band shifts to lower is observed at 918 The band observed at 1349 has frequency and the intensity of the band is decreased, which been attributed to combination frequencies of (CH + OH).”
Siddaiah 等 - 2018 - DOI: 10.1590/1980-5373-MR-2017-0987 -
Nitro (NO2) confianza 1,0
“The nitro stretching vibrations 2) at 1526 and 1349 cm-1, in the spectrum of 2-nitrobenzaldehyde shifted to a lower frequency at 1586 1517 and cm-1, 1337 respectively, upon formation of NB.”
Sunjuk 等 - 2022 - Transition Metal Complexes of Schiff Base Ligands DOI: 10.3390/inorganics10040043 -
Nitro (NO2) confianza 0,9
“Absorption band for NS gas phase.”
Selective hydrogenation of nitrostyrene to aminostyrene over Pt/TiO2 catalysts : Effects of pressurized carbon dioxide and catalyst preparation conditions DOI: 10.1016/j.supflu.2011.02.016
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