What absorbs at 903 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 903 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 6 cited sources
Quick answer
A band near 903 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 |
|---|---|---|---|
| Phosphorus | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Oxygen heterocycle | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Nitrate | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 0 | 1,0 |
| Methyl | 1 | 0 | 1,0 |
| Methoxy (OCH3) | 1 | 0 | 1,0 |
| Methacrylate | 1 | 0 | 1,0 |
| Acetate | 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.
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 903 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
-
Ring structure confianza 1,0
“6 here) cm-1 In the literature, the 903 band is assigned to ring C-H wagging and C-C”
Investigation on the overlapping bands of sydiotactic polystyrene by using 2D-IR spectroscopy DOI: 10.1016/j.molstruc.2016.03.103 -
Nitrate confianza 1,0
“besides the main peaks at m/z = 422 and m/z = 842, AM1d quantum semiempirical method use the Schro¨dinger other peak clusters at m/z = 903 and m/z = 921 assigned Er]+ equation to determine geometry, bond strengths, atomic to the complexes [”
Przybylski 等 - 2008 - ESI MS, spectroscopic and semiempirical characteri DOI: 10.1016/j.molstruc.2007.07.039 -
Oxygen heterocycle confianza 1,0
“appear at 878.8 From the viewpoint of photochemistry, it is instructive to This mode (due to the deformation of the oxirane three-membered ring) was assigned to the expericompare DGAn with other cyclic molecules with several single cm-1 men”
Jarmelo 等 - 2008 - Matrix-Isolated Diglycolic Anhydride Vibrational DOI: 10.1021/jp805603b -
Phosphate (PO4) confianza 1,0
“distinct absorptions at 903, 988, 1032, and Spectral subtraction of these two spectra suggested that these phosphate absorptions were deeper in the bioreduced compared with the heated abiotic control spectrum.”
Kashyap 等 - 2023 - Spectral Detection of Nanophase Iron Minerals Prod DOI: 10.1089/ast.2022.0042 -
Amide confianza 1,0
“940 cm-1 and 1169 cm-1 are C-N stretching vibrations of imidazole groups and C=N stretchThe absorption peak at 903 cm-1 originated from the epoxy group of the polymer, which ing vibrations at 1570 cm-1 [22].”
Design and Preparation of Imidazole Ionic Liquid-Based Magnetic Polymers and Its Adsorption on Sunset Yellow Dye DOI: 10.3390/ma15072628 -
Phosphate (PO4) confianza 1,0
“results in the formation of a new phosphate peak at 903”
Narwade 和 Khairnar - 2017 - Cobalt adsorption on the nano-hydroxyapatite matri DOI: 10.1515/bpasts-2017-0016
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