What absorbs at 763 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 763 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 763 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| N h | 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 |
| Phosphate (PO4) | 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.
Materiales posibles
| Material | Picos de apoyo | Grupos superpuestos | Fuentes citadas |
|---|---|---|---|
| graphene oxide | 763, 1150, 3400 | Methacrylate, Acetate, Alkyl C-H | 1 |
| chitosan | 763, 1650, 1655 | Alkyl C-H, Acetate, Methacrylate | 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 763 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
-
Alkyl C-H confianza 1,0
“The attachment of CTS-Si to HNT can be denoted by the C-H stretching ameter were 762.53 m2/g, 0.3154 cm3 g-1, 0.1911 nm3 g-1, and 6.10 nm, respectively.”
Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673 -
Acetate confianza 1,0
“The vibration located at 3,313 is attributed to N-H stretching, the vibration cm-1 cm-1 located at 1,700 is attributed to C=O stretching, and the vibration located at 763 is attributed”
Nansen 等 - 2010 - Using Spatial Structure Analysis of Hyperspectral DOI: 10.3390/rs2040908 -
Acetate confianza 1,0
“The bands from 763 to corresponded to the C-O bond stretching.”
Xu 等 - 2005 - Chitosan-starch composite film preparation and ch DOI: 10.1016/j.indcrop.2004.03.002 -
confianza 1,0
“The Raman signal 311 cm-1 is generated by Mg jumping at the tetrahedral position, and the signal 763 cm-1 is caused by the symmetric stretching vibration of Mg-O in the tetrahedral cell.”
Zhao 等 - 2022 - Gemological and Spectroscopic Characteristics of DOI: 10.3390/min12111359 -
Acetate confianza 1,0
“In Figure 2A, ATR-FTIR spectra of the ARP gave characteristic peaks at to a reduction in the stretching vibrations of the ARP molecule due to its accumulation in cm-1 cm-1 cm-1 1672 (carbonyl peak), 1027 (for C-O-C stretch), as well as 763”
Awais 等 - 2023 - Enhanced Solubility and Stability of Aripiprazole DOI: 10.3390/molecules28093860 -
Alkyl C-H confianza 1,0
“cm-1 The presence of the maximal 830 value is connected with bending vibrations of carboxylic cm-1 ions, while the band at 763 may be associated with rocking vibrations of -CH 2groups [38-45].”
Swelling of Hydrogels Based on Carboxymethylated Starch and Poly(Acrylic Acid): Nonlinear Rheological Approach DOI: 10.3390/polym12112564 -
Carbonyl (C=O) confianza 1,0
“cm-1 cm-1 and 1244 are related to vibrational modes of the aromatic ring, while The bands around 1007 cm-1 cm-1 and 828 are due to the bending of the C=O bond and of the CH bond the bands at 763 cm-1 are likely due to respectively.”
Pace 等 - 2013 - An innovative photochemical facility at DA Phi NE- DOI: 10.1088/1742-6596/425/7/072024 -
Alkyl C-H confianza 1,0
“It could be also noticed in Figure 1, the presence of cm-1 three intense absorption bands with peaks at 1072 corresponding to the stretching cm-1 vibrations Si-O, at 763 assigned to the bending vibrations of the C-H bond [16] and”
Synthesis and Characterization of Some Graphene Oxide Powders Used as Additives in Hydraulic Mortars DOI: 10.3390/app112311330
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