What absorbs at 1129 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1129 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 7 cited sources
Quick answer
A band near 1129 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 |
|---|---|---|---|
| C c single bond | 2 | 2 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 0,9 |
| S eq o | 1 | 1 | 0,9 |
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 |
|---|---|---|---|
| polystyrene | 1129, 1020, 1600 | Aromatic ring | 1 |
| diamond | 1129, 1378, 1332 | Aromatic ring | 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 1129 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
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confianza 1,0
“These peaks have been cussed in the FTIR section, sample TE309 showed strong band.20,21 Two of the attributed to a tungsten vibronic absorption in the one-phonon region, as was the case for (cid:126)TA1129 NTA1018(cid:33) samples and showed”
Haque 等 - 1998 - Comparison of infrared, Raman, photoluminescence, DOI: 10.1063/1.367201 -
C c single bond confianza 1,0
“LLM confirmed rule peak-group candidate”
Application of FTIR and Raman microspectroscopy to the study of food/packaging interactions DOI: 10.1080/02652030903148306 -
C c single bond confianza 1,0
“15 linear baseline correction, (ii) normalization according to the area of the LLDPE specific band at 1129 146 16 o 17 cm-1 representing the symmetric C-C stretching of all-trans PE chains.”
Effect of HP/T treatments of in-package food on additive migration from conventional and bio-sourced materials DOI: 10.1080/19440040903268054 -
Aromatic ring confianza 1,0
“At the same time, the comparison of spectra yields did cm-1, hemicelluloses appeared at 1736.58 while the aromatic skeletal vibration in lignin not reveal the presence of sulfonate functional groups around 1129 cm-1, which is possibly cm-1.”
Adsorptive Performance of Walnut Shells Modified with Urea and Surfactant for Cationic Dye Removal DOI: 10.3390/w15081536 -
S eq o confianza 0,9
“Explicit assignment: 'S=O stretching (1326 and 1129 cm-1)'”
Ektirici 等 - 2022 - Computational Investigation of the Monomer Ratio a DOI: 10.1021/acsomega.2c00862 -
confianza 0,9
“Text: 'strong peak that is observed at 1129 corresponds to aryl fluoride'”
El-Say 等 - 2015 - Risperidone oral disintegrating mini-tablets A ro DOI: 10.1515/acph-2015-0038 -
Sulfonyl confianza 0,9
“Assigned to O=S=O in -SO3H”
Liu 等 - 2019 - Novel Selective Depressant of Titanaugite and Impl DOI: 10.3390/min9110703
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