What absorbs at 793 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 793 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 793 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 6 | 6 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Metal oxygen | 3 | 3 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Metal oxo | 1 | 1 | 0,9 |
| C-S single 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 |
|---|---|---|---|
| chitosan | 793, 1650, 1655 | Alkyl C-H | 1 |
| montmorillonite | 793, 1637, 523 | Silicon-oxygen (Si-O), Silicon (Si) | 1 |
| bentonite | 793, 882, 918 | Silicon-oxygen (Si-O), Silicon (Si), Metal oxygen | 1 |
| ZnO NPs | 793, 1664, 875 | Alkyl C-H, Metal oxygen | 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 793 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
-
Alkyl C-H confianza 1,0
“LLM confirmed rule peak-group candidate”
Chatterjee 等 - 2013 - Nanochannel morphology of polypyrrole-ZnO nanocomp DOI: 10.1039/c3ta12796f -
Carbon dioxide confianza 1,0
“ofsoilsfromTrtoK2horizonsandA1toBhshorizonsarethecombinawhich suggests a decrease of the crystallinity of the quartz structure cm-1 tion of the bands at 797 and 778 possibly due to hydrolysis by water containing carbon dioxide (A1 to Bhs) i”
Clabel 等 - 2020 - Organo-mineral associations in a Spodosol from nor DOI: 10.1016/j.geodrs.2020.e00303 -
confianza 1,0
“Si-O-C stretching vibration Si-O-Si 793 792 Si-O-Si symmetric vibration Si-O-Si”
Ganie 等 - 2020 - Synthesis and Characterization of a New Surface-Mo DOI: 10.1155/2020/8814260 -
Aromatic ring confianza 1,0
“The strong sharp bands at 760 cm-1, 793 cm-1, and 822 cm-1 can be ascribed cm-1 cm-1, to o-disubstituted benzene ring vibration [38].”
Synthesis, Characterization and Biological Activities of New Schiff Base Compound and Its Lanthanide Complexes DOI: 10.3390/ph15040454 -
Silicon-oxygen (Si-O) confianza 1,0
“The 913 band stems from the Al-Al-OH bending mode, the 793 cm-1 band indicates the presence of quartz, the 625 band stems from out-of-plane Al-O-Si cm-1”
Rehydration Driven Na-Activation of Bentonite—Evolution of the Clay Structure and Composition DOI: 10.3390/ma14247622 -
confianza 1,0
“the aromatic nucleus, C-H [6].The C-N stretching vibration 311 (υ Ag-Cl) [8] islocatedaround1373cm-1.Thebandat793cm-1represents Stretching vibrations of the bridging halogen 250 the out-of-plane bending C-H [3, 5, 7].The relative intensity”
Benahmed 等 - 2018 - Spectroscopic Study of PolyanilineAgCl@Ag Nanocom DOI: 10.1155/2018/7320654 -
Ring structure confianza 1,0
“genipin.41 bonds in the chitosan crosslinked with The new broad peak C-C, CH, C-O and OH (ab- ---------- 2412, 793 cm-1 that appeared near 1415 after crosslinking with genipin is assosorption of glibenclamide) ciated with the ring-stretchin”
Delgadillo-Armendariz 等 - 2014 - INTERACTIONS OF CHITOSANGENIPIN HYDROGELS DURING DOI: 10.5935/0100-4042.20140243 -
Metal oxygen confianza 1,0
“On the other cm-1 hand, the band of the Al-O bond at 793 is also shifted to the right.”
Ivanovic 等 - 2020 - The Effect of the Concentration of Alkaline Activa DOI: 10.2298/SOS2002219I
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