What absorbs at 834 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 834 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
Respuesta rápida
A band near 834 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) | 3 | 3 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Chlorine | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Imide | 1 | 1 | 1,0 |
| Acetyl | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 0,9 |
| Metal oxygen | 1 | 0 | 0,9 |
| Oxygen heterocycle | 1 | 0 | 0,9 |
La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.
Materiales posibles
| Material | Picos de apoyo | Grupos superpuestos | Fuentes citadas |
|---|---|---|---|
| PVC | 834, 1195, 1100 | Alkyl C-H | 3 |
| PMMA | 834, 1722, 1383 | Alkyl C-H | 1 |
| silica | 834, 1100, 1080 | Silicon-oxygen (Si-O), Silicon (Si), Alkyl C-H | 1 |
| SiO2 | 834, 1739, 699 | Silicon-oxygen (Si-O), Alkyl C-H, Silicon (Si) | 1 |
| silver nanoparticles | 834, 1636, 1631 | Alkyl C-H | 1 |
Los materiales se muestran solo cuando el mismo grupo de literatura respalda esta banda y al menos un pico característico adicional.
Lógica de espectro
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 834 cm⁻¹ is usually not enough for material identification by itself.
Uso en el mundo real
Este tipo de consulta es común en la identificación de polímeros, cribado de plásticos desconocidos, resolución de problemas de control de calidad, verificación de materiales reciclados y revisión de asignación de picos respaldada por la literatura.
Errores comunes
- Tratar una banda aislada como prueba de un material sin verificar al menos uno o dos picos de apoyo.
- Ignorando superposición: múltiples grupos funcionales pueden contribuir cerca del mismo número de onda.
- Omitir la validación cuando los aditivos, las mezclas, la oxidación o la contaminación puedan distorsionar el espectro.
Consejo de verificación
Cuando persista la ambigüedad, valide la hipótesis con DSC, GC-MS o TGA, especialmente para mezclas, muestras degradadas y polímeros rellenos.
Literatura detrás de estas asignaciones
-
Silicon (Si) confianza 1,0
“While, absorption at 834 shows the Si-O-Si asymmetric of silanol (Si-OH) at 966 cm-1 there were absorption stretching [24].”
Ismail 等 - 2015 - Effect of Radiation on Properties of ENRPVCSiO2 DOI: 10.1063/1.4931308 -
C c single bond confianza 1,0
“Besides, the bands between 600 cm-1 and 700 cm-1, 834 cm-1 could be attributed cm-1 ascribed to the C-C stretching and -CH wagging, respectively.”
Understanding Hydrothermal Dechlorination of PVC by Focusing on the Operating Conditions and Hydrochar Characteristics DOI: 10.3390/app7030256 -
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 -
confianza 1,0
“The pronounced in the Synth1 sample, where the three bands are cm-1 strong and sharp peaks at 834 and 705 are assigned to the not anymore identifiable and a unique broad band is observed, n2 n4 out-of-plane OCO bending mode and to the antis”
Investigation of the hydrozincite structure by infrared and solid-state NMR spectroscopy DOI: 10.2138/am.2013.4158 -
Alkyl C-H confianza 1,0
“cm1 cm1 stretching at 671.43 and 892.51 The peaks at 834.50 and 798.47 indicate C-H deformation and ring stretching of trisubstituted benzene.”
Agrawal 等 - 2023 - Biotreatment of azo dye containing textile industr DOI: 10.21203/rs.3.rs-1876766/v2 -
Lipid confianza 1,0
“Medium-weak bands, only detectable in the FTIR spectrum of carnauba wax at 1634, 1607, 1515 and 834 cm-1, are attributed to the skeletal ring breathing modes of aromatic groups [30,47].”
Characterization of Waxes in the Roman Wall Paintings of the Herculaneum Site (Italy) DOI: 10.3390/app122111264 -
confianza 1,0
“The cm(cid:1)1 N-H peak at 834 is due to the out-of-plane bending”
Facile simultaneous synthesis of tetraaniline nanostructures/silver nanoparticles as heterogeneous catalyst for the efficient catalytic reduction of 4-nitrophenol to 4-aminophenol DOI: 10.1039/d0ra03327h -
confianza 1,0
“It was 1089.6cm-1 (S=O stretching vibration) and 1136.8, and also observed that some peaks shown by pure etoricoxib 639.22009cm-1 (C-Cl stretching vibra834.0, 777.1, and were absent, and the intensity of peaks of these etoricoxib tion).”
Das 等 - 2011 - Solubility and dissolution enhancement of etoricox DOI: 10.5402/2011/819765
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