What absorbs at 928 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 928 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 928 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 |
|---|---|---|---|
| Acetate | 4 | 4 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Metal oxygen | 2 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
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 |
|---|---|---|---|
| cellulose | 928, 1735, 1650 | Alkyl C-H, Acetate, Methacrylate | 1 |
| hemicellulose | 928, 1730, 897 | Alkyl C-H, Methacrylate, Acetate | 1 |
| SiO2 | 928, 1739, 699 | Alkyl C-H, Methoxy (OCH3) | 1 |
| lignin | 928, 1035, 1510 | Alkyl C-H, Methacrylate, Acetate | 1 |
| biomass | 928, 1082, 1282 | Alkyl C-H, Methacrylate, Acetate | 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 928 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
-
Acetate confianza 1,0
“The peak at 927.80 indicates vibrations from C-O stretching”
Mahardiani 等 - 2022 - Nanofiber Fabrication from Palm Fiber Waste for Su DOI: 10.48317/IMIST.PRSM/morjchem-v10i2.32648 -
Alkyl C-H confianza 1,0
“The peak located at 928 manufacturers in the tequila region of Amatitán, cm-1 was due to the bending of the C-H bond of the Jalisco, Mexico.”
Mondragon-Cortez 等 - 2022 - Application of Fourier transform infrared spectros DOI: 10.24275/rmiq/Alim2806 -
Alkyl C-H confianza 1,0
“The XRD spectrum of Agr shows a peak 19.1◦ ∼ 2θ 1556.6 cm-1 and 1404.6 cm-1, N-H out of plane wagging at 608.8 cm-1, and C-H stretching at 928.2 at with the intensity of 1624 (a.u), which demonstrates the semi-crystalline nature of ∼ at 2θ”
Development of Biodegradable Agar-Agar/Gelatin-Based Superabsorbent Hydrogel as an Efficient Moisture-Retaining Agent DOI: 10.3390/biom10060939 -
Acetate confianza 1,0
“Similarly, the C-O stretching at 928 C-H stretching at can replace calcium in body.”
Dubey 等 - 2022 - Investigation of Hazardous Materials in Firecracke DOI: 10.14429/dsj.72.17836 -
Amide confianza 1,0
“C-OstretchingandC-OHbending polysaccharides(e.g.,glucose) PO32968 DNAandRNAribose stretching DNAandRNAribose-phosphatechain C-N+-Cstretching 928”
Fourier-Transform Infrared Spectroscopy as a Discriminatory Tool for Myotonic Dystrophy Type 1 Metabolism: A Pilot Study DOI: 10.3390/ijerph18073800 -
Water (H2O) confianza 1,0
“cm-1 cm-1, both DFO-B applications, the increased maxima at 1637 and 3342 assigned to as the intensive agarose peaks at 1370cm-1, 1037 cm-1, 928 cm-1, 887 cm-1 and 768 cm-1 were hydroxyls, are probably due to the water absorbed during the a”
Desferrioxamine B: Investigating the Efficacy of Hydrogels and Ethanol Gels for Removing Akaganeite and Maghemite from Dry Wooden Substrates DOI: 10.3390/f14020247 -
Silanol (Si-OH) confianza 1,0
“Indeed, the decay processes of atomic Figure sity of Si-OH and H-OH peaks located at wavenumbers → → oxygen such as O + O + N O +N or O + O + surface O around 928 cm-1 and 3400 cm-1.”
Atmospheric Plasma-Enhanced Spatial Chemical Vapor Deposition of SiO 2 Using Trivinylmethoxysilane and Oxygen Plasma DOI: 10.1021/acs.chemmater.0c01148 -
Alkyl C-H confianza 1,0
“C-H vibration of aldehyde group C=O 1671 in conjugated carbonyl group Furfural C=C 1465 stretching of furan ring 1276/1021 C-O stretching vibration 928/884/755 C-H bending out of plane peaks”
Zhuang 等 - 2020 - Observation of Potential Contaminants in Processed DOI: 10.3390/app10124345
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