What absorbs at 799 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 799 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 799 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) | 8 | 8 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 0,9 |
| Boron nitrogen | 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.
Materiales posibles
| Material | Picos de apoyo | Grupos superpuestos | Fuentes citadas |
|---|---|---|---|
| silica | 799, 1100, 1080 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 2 |
| hematite | 799, 1030, 469 | Silicon-oxygen (Si-O), Siloxane (Si-O-Si), Silicon (Si) | 2 |
| TiO2 | 799, 1700, 1093 | Alkyl C-H | 1 |
| CaO | 799, 2909, 1839 | Silicon-oxygen (Si-O) | 1 |
| TiO | 799, 1730, 1699 | Alkyl C-H | 1 |
| kaolinite | 799, 3696, 693 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 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 799 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
“4 SEM micrograph of 2-AKC at × 500 and × 1000 magnifications cm-1, cm-1 cm-1 The peaks at 799.10 757.78 and 797.78 were assigned to the Si-O stretching of the kaolin clay type.”
Preparation and characterization of adsorbents derived from bentonite and kaolin clays DOI: 10.1007/s13201-018-0827-2 -
C-O single bond confianza 1,0
“FTIR spectroscopy Mössbauer spectroscopy d-OH indicated that goethite of type 1 is characterized by the presence of the band between 799 Iron ores 802cm(cid:3)1, 904cm(cid:3)1 c-OH the between 898 and and the bulk hydroxyl stretch between 3”
Spectroscopic characterization of iron ores formed in different geological environments using FTIR, XPS, Mössbauer spectroscopy and thermoanalyses DOI: 10.1016/j.saa.2014.10.090 -
confianza 1,0
“Bending H-O-H viclay spectra, Si-O vibrations at wavenumber bration occurs in the area between 600-950 799 cm-1 indicate the presence of quartz minercm-1.”
Natural Clay of Pasaman Barat Enriched by CaO of Chicken Eggshells as Catalyst for Biodiesel Production DOI: 10.9767/bcrec.15.3.8097.662-673) -
Silicon-oxygen (Si-O) confianza 1,0
“The doublet cm(cid:1)1 cm(cid:1)1 superficial corresponds to the dermis containing many absorption bands at 799 and 776 due to the cm(cid:1)1 a-quartz SieOeSi granulomas.”
Detection of silica and calcium carbonate deposits in granulomatous areas of skin sarcoidosis by Fourier transform infrared spectroscopy and Field Emission Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy analysis DOI: 10.1016/j.crci.2016.05.007 -
Acetate confianza 1,0
“The band cm-1 recorded at 799 is ascribed to the C-O stretching vibrations.”
Kannan 等 - 2023 - Exploration of third order nonlinear optical featu DOI: 10.15251/DJNB.2023.181.367 -
Alkyl C-H confianza 1,0
“These observations are mainly due to the overlapping with the weak peak peak at 799 cm-1 which is designated as the CH2 rocking mode of PAA.”
Liew 等 - 2016 - Poly(Acrylic acid)-Based Hybrid Inorganic-Organic DOI: 10.3390/polym8050179 -
Silicon (Si) confianza 1,0
“cm-1(Si-O-Si cm-1 cm-1 symmetrical stretching vibration) and at 693 and 469 (Si-O-Si symmetrical at 777 and 799 cm-1(Si-O-Si symmetrical stretching vibration) and at 693 cm-1 and 469 cm-1 (Si-O-Si and asymmetrical bending vibration, overlap”
Ma 等 - 2019 - Investigation of the Optical, Physical, and Chemic DOI: 10.3390/su11143803 -
Silicon (Si) confianza 1,0
“After the first step, cm-1 cm-1 and 465 (SI-Or1), the bands centered at 799 related to Si-O-Si bonds disappeared which confirms that”
Marin 等 - 2015 - Revalorization of Rice Husk Waste as a Source of C DOI: 10.1007/s12221-015-0285-5
¿Tiene un espectro con esta banda?
Cargue su espectro FTIR y obtenga un informe de interpretación completo — asignaciones de picos con citas bibliográficas, coincidencias de librerías y una cadena de evidencia con calificación de confianza — en segundos.