What absorbs at 1174 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1174 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 1174 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 |
| Alkyl C-H | 6 | 6 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Sulfonate | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Phospholipid | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 0,9 |
| S eq o | 1 | 1 | 0,7 |
| Amide | 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 |
|---|---|---|---|
| chitosan | 1174, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 1 |
| chitin | 1174, 1650, 1655 | Methacrylate, Acetate, C-O single bond | 1 |
| polymers | 1174, 1726, 1743 | Methacrylate, Acetate, C-O single bond | 1 |
| ZnO | 1174, 1400, 3430 | Acetate, Methacrylate, 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 1174 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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Alkyl C-H confianza 1,0
“The result of FTIR studies revealed different functional groups of organic compounds such as out-of-plane cm-1), cm-1), C-O-C bending (564 stretching (711 and CH stretching 2 cm-1) (1174 in chitosan.”
Varma 和 Vasudevan - 2020 - Extraction, Characterization, and Antimicrobial Ac DOI: 10.1021/acsomega.0c01903 -
Carbohydrate confianza 1,0
“Thermal gravimetric analysis was used to determine the total cm(cid:0) 1 band at ~1174 is correlated with proteoglycan protein for both amount of organic content in the shells (excluding the periostracum).”
Organic biopolymers of venus clams: Collagen-related matrix in the bivalve shells with crossed-lamellar ultrastructure DOI: 10.1016/j.bbrep.2021.100939 -
Alkyl C-H confianza 1,0
“The cm-1 therefore reasonable to record that ZnO NPs have been absorption at 1174, 1498, and 1597 is due to the (C-H”
Bir 等 - 2022 - Multifunctional Ternary NLPZnO@L-cysteine-grafted DOI: 10.1021/acsomega.2c04936 -
Acetate confianza 1,0
“C-H Symetric (CH 3) 1240 C-O Stretching (arylesters) 1174 v(C-O) of ester (cottonseed oil), TiO et BaSO vibration 2 4 1119”
Chemical Degradation and Color Changes of Paint Protective Coatings Used in Solar Glass Mirrors DOI: 10.3390/coatings11040476 -
Phospholipid confianza 1,0
“(PO2-) 1458 and 1396 The phosphodiester groups arise lipids arises at 1462 cm-1, cm-1,1174 cm-1 cm-1, 1233 and 1079 which from phospholipids bands at 1339”
Toxicity mechanism of Cu2+ ion individually and in combination with Zn2+ ion in characterizing the molecular changes of Staphylococcus aureus studied using FTIR coupled with chemometric analysis DOI: 10.1007/s10867-020-09560-7 -
Acetate confianza 1,0
“cm-1 (out-of-plane curved NH, out-of-plane curved C-O), 711 (out-of-plane curved NH), cm-1 cm-1 cm-1 1174 (C-O-C stretch), 2865 (CH stretch), and 3594 (-OH stretch).”
Extraction Optimization and Structural Characteristics of Chitosan from Cuttlefish (S. pharaonis sp.) Bone DOI: 10.3390/ma15227969 -
Alkyl C-H confianza 1,0
“LLM confirmed rule peak-group candidate”
Kumar 和 Barth - 2010 - Following Enzyme Activity with Infrared Spectrosco DOI: 10.3390/s100402626 -
Hydroxyl (O-H) confianza 1,0
“Materials 2022, 15, 8826 11 of 18 spectra were found to exhibit very intense double bands with maxima at 1258 and 1174 cm-1 assigned to the CAr-O-H groups from the phenol moieties.”
A Top-Down Approach and Thermal Characterization of Luminescent Hybrid BPA.DA-MMA@Ln2L3 Materials Based on Lanthanide(III) 1H-Pyrazole-3,5-Dicarboxylates DOI: 10.3390/ma15248826
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