What absorbs at 1228 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1228 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 1228 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) | 6 | 6 | 1,0 |
| Methacrylate | 6 | 6 | 1,0 |
| C-O single bond | 6 | 6 | 1,0 |
| Acetate | 6 | 6 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Aromatic ring | 3 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Protein beta sheet | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| N-O bond | 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 |
|---|---|---|---|
| hydroxyapatite | 1228, 1620, 1639 | Methacrylate, Acetate | 1 |
| silver nanoparticles | 1228, 1636, 1631 | Methacrylate, Acetate, 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 1228 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
-
Acetate confianza 1,0
“present in the peaks at 1034 (carbon-oxy- (32.6)A (0.9)A 2.5 159.6 4.9 cm-1 gen (C-O) stretching), at 1228 (carbon-hydrogen”
Acetylation of tropical hardwood species from forest plantations in Costa Rica: an FTIR spectroscopic analysis DOI: 10.1186/s10086-020-01898-9 -
Aromatic ring confianza 1,0
“The peaks at cm-1 cm-1 1228 and 1072 were attributed to aromatic ether C-O or C-O-C stretching.”
Nematicidal activity of seaweed-synthesized silver nanoparticles and extracts against Meloidogyne incognita on tomato plants DOI: 10.1038/s41598-022-06600-1 -
Sulfate (SO4) confianza 1,0
“LLM confirmed rule peak-group candidate”
In vivo prebiotic properties of Ascophyllum nodosum polysaccharide hydrolysates from lactic acid fermentation DOI: 10.1007/s10811-019-01794-w -
Phosphate (PO4) confianza 1,0
“2 9 cm-1 and proteins, a peak at 1228 due to P=O stretching of phosphate-carrying compounds cm-1 and at 1053 due to bands of carbohydrates within the microbial cell walls [14,16].”
Quantification of live Lactobacillus acidophilus in mixed populations of live and killed by application of Attenuated Reflection Fourier Transform Infrared Spectroscopy combined with Chemometrics DOI: 10.1016/j.jpba.2018.03.009 -
Amide confianza 1,0
“LLM confirmed rule peak-group candidate”
A comparative study on silicon nitride, titanium and polyether ether ketone on mouse pre-osteoblast cells DOI: 10.1002/mds3.10139. -
confianza 1,0
“The GO:CA (0:1) sample spectrum, shown in Figure 5b, presentsbandsat439cm-1 1228cm-1 improved reduction of GO.”
Joining Caffeic Acid and Hydrothermal Treatment to Produce Environmentally Benign Highly Reduced Graphene Oxide DOI: 10.3390/nano11030732 -
Hydroxyl (O-H) confianza 1,0
“Projections after winter exposure were also characterized by signals from aromatic skeletal, i.e., signals cm-1 cm-1and at 1516 and 1440 from C = C stretching of aromatic rings and from phenols, at 1359 1228 cm-1 from O-H deformation and C-”
Photodegradation of typical Mediterranean plant litters: variations with Quercus species and the leaf-surface exposed DOI: 10.1007/s10342-022 -
Acetate confianza 1,0
“The bands at 1228 and 1179/cm were assigned to the chain conformation and the stretching vibration of C-O-C, respectively.”
Biodegradation of P(3HB-co-4HB) powder by Pseudomonas mendocina for preparation low-molecular-mass P(3HB-co-4HB) DOI: 10.1007/s13205-017-0824-4
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