What absorbs at 3154 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 3154 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 3154 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) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Aldehyde (CHO) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| N h | 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 |
|---|---|---|---|
| chitosan | 3154, 1650, 1655 | Acetate, Methacrylate, Hydroxyl (O-H) | 1 |
| Fe2O3 | 3154, 1130, 1631 | Hydroxyl (O-H), Methacrylate, Acetate | 1 |
| ZnO | 3154, 1400, 3430 | Hydroxyl (O-H), Acetate, Methacrylate | 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 3154 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
-
Amine primary confianza 1,0
“The broad absorption peak at 3154 is due to cm-1 symmetric stretching mode of -NH 2.”
Karuppannan 和 Prashantha - 2010 - Nano structured carbon nitrides prepared by chemic DOI: 10.1117/12.861609 -
Acetate confianza 1,0
“The band which appears at 3154 is attributed to ( = O - CH 3) double 265 37 38”
Misenan 等 - 2018 - Electrical and structural studies of polymer elect DOI: 10.1088/2053-1591/aac25b -
Hydroxyl (O-H) confianza 1,0
“As shown in Figure S4 (zoomed part), prominent cm-1 cm-1 O-H 1250 can be attributed to stretching, while bands are because of stretching bands at 1576, 1607, and 1628 cm-1 C-H are due to the stretching of at 2857 and 2924 vibrations of the”
Bir 等 - 2022 - Multifunctional Ternary NLPZnO@L-cysteine-grafted DOI: 10.1021/acsomega.2c04936 -
Carbon dioxide confianza 1,0
“The intense bands at 1642.79 cm-1 and 3153.55 cm-1 were then assigned to CO2 vibration and O-H vibrations, respectively, ratifying the presence of surface γ-Fe2O3 hydroxyl groups.”
Fauzi 等 - 2020 - Nanostructured ChitosanMaghemite Composites Thin DOI: 10.3390/polym12071497 -
C=n confianza 1,0
“1, showed NH stretching 8.33(cid:4), 18.5(cid:4), 19.78(cid:4), 23.5(cid:4) 28.08(cid:4) 2q ¼ peaks at and with limited cm(cid:3)1, vibration peak at 3154 while the imine stretching peak (011).37 planes at (010), (110) and cm(cid:3)1.”
Microwave-assisted facile synthesis of poly(luminol-co-phenylenediamine) copolymers and their potential application in biomedical imaging DOI: 10.1039/c8ra08373h -
N h confianza 0,9
“assigned to N-H stretching”
Adam 等 - 2022 - Comparative Evaluation of Amlodipine Besylate Gene DOI: 10.14227/DT290422PGC2 -
Hydroxyl (O-H) confianza 0,8
“attributed to -OH stretching”
Chiral Tartaric Acid Improves Fracture Toughness of Bioactive Brushite–Collagen Bone Cements DOI: 10.1021/acsabm.0c00555
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