What absorbs at 1254 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1254 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 1254 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-O single bond | 7 | 7 | 1,0 |
| Alkyl C-H | 5 | 5 | 1,0 |
| Methoxy (OCH3) | 5 | 5 | 1,0 |
| Methacrylate | 5 | 5 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Hydrogen bond | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Oxygen heterocycle | 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 |
|---|---|---|---|
| SiO2 | 1254, 1739, 699 | Alkyl C-H, Methoxy (OCH3) | 2 |
| PVC | 1254, 834, 1195 | Alkyl C-H, Methoxy (OCH3), Methacrylate | 2 |
| PMMA | 1254, 1722, 1383 | Methacrylate, Alkyl C-H, Methoxy (OCH3) | 1 |
| MgO | 1254, 699, 874 | Alkyl C-H, Methoxy (OCH3), Methacrylate | 1 |
| Polyurethane | 1254, 2270, 1700 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| SiO | 1254, 800, 1745 | Methacrylate, Methoxy (OCH3), C-O single bond | 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 1254 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
-
Oxygen heterocycle confianza 1,0
“at In addition, the bands revealed around 1254, 1070, and are Si-C, Si-O-C, related to and epoxy groups, respectively, of the glycidyoxypropylsilane [48].”
Alkali and epoxy-silane surface modified pine cone flour reinforced polypropylene/poly (lactic acid) DOI: 10.1080/01694243.2021.1952677 -
confianza 1,0
“This corresponds to one of two overlapping cm-1 Val49 is near the lysine side chain (Figure 1), this result is in BR (Figure 3b), which was assigned bands at 1254 N-H 15-H consistent with an unchanged environment along the aliphatic to the”
Maeda 等 - 1999 - Chromophore-protein-water interactions in the L in DOI: 10.1021/bi9907072 -
Acetate confianza 1,0
“The bands at 1254 is assigned to asymmetric vibration of C-O-C while cm-1 are indicating the presence of C-O-C (epoxy ring) vibration and C-Cl of the absorption peaks at 874 and 699”
Nor 等 - 2013 - Gas Permeability of ENRPVC Membrane with the Addi DOI: 10.1063/1.4858770 -
Alkyl C-H confianza 1,0
“For PVC, C H stretching mode can be S.Rameshetal./SpectrochimicaActaPartA66(2007)1237-1242 1239 Table2 VibrationalmodesandwavenumbersexhibitedbyPMMA Wavenumbers(cm-1) Descriptionofvibrations References C Hstretching 2927-2986 [30,32] C Ostr”
Ramesh 等 - 2007 - FTIR studies of PVCPMMA blend based polymer elect DOI: 10.1016/j.saa.2006.06.012 -
Acetate confianza 1,0
“Besides, the C-O-C stretching and deformation vibration were found at 1253.7 and 1123.7 cm-1, respectively, while peaks at 993.7, 772.8, 694.8, and 525.8 cm-1 were due to the C-H bending vibrations of polymer networks [30].”
Development of Biodegradable Agar-Agar/Gelatin-Based Superabsorbent Hydrogel as an Efficient Moisture-Retaining Agent DOI: 10.3390/biom10060939 -
Alkyl C-H confianza 1,0
“On the other hand, the absorption peak located at 1254.49 cm-1 is due to the CH deformation in the bond Si-CH [39] Moreover, the peak intensity”
Cimavilla-Roman 等 - 2020 - Influence of silica aerogel particles on the foami DOI: 10.1016/j.eurpolymj.2020.109884 -
Acetate confianza 1,0
“The peak at 1254 cm-1, associated with C-O stretching in lignin, is more without bleaching showed more surface irregularities.”
Characterization of Natural Fiber Extracted from Corn (Zea mays L.) Stalk Waste for Sustainable Development DOI: 10.3390/su142416605 -
Acetate confianza 1,0
“bond elongation), from 1230 to cm-1 evolution curve in EGA-MS supports the TG/DTA results 1254 (C-O-C asymmetric stretching;”
Thermal decomposition of tris(O-ethyldithiocarbonato)-antimony(III)—a single-source precursor for antimony sulfide thin films DOI: 10.1007/s10973-021-10885-1
¿Tiene un espectro con esta banda?
Cargue su espectro FTIR y obtenga un informe de interpretación completo — asignaciones de picos con citas bibliográficas, coincidencias de librerías y una cadena de evidencia con calificación de confianza — en segundos.