What absorbs at 1253 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1253 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 1253 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 |
|---|---|---|---|
| Methacrylate | 8 | 8 | 1,0 |
| Acetate | 8 | 8 | 1,0 |
| C-O single bond | 7 | 7 | 1,0 |
| Methoxy (OCH3) | 7 | 7 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 2 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| N h | 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.
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 1253 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 band 1253cm-1 is assigned for the C-O stretching between at”
Das 等 - 2004 - Kinetics and adsorption behaviour of salicylate on DOI: 10.1016/j.colsurfa.2004.02.010 -
Acetate confianza 1,0
“cm-1 agave is carried out in masonry ovens at a temperature The peak at 1253 was related to C-O and Ccm-1 of 95 °C for a period time between 28 and 48 h.”
Mondragon-Cortez 等 - 2022 - Application of Fourier transform infrared spectros DOI: 10.24275/rmiq/Alim2806 -
Carboxyl (COOH) confianza 1,0
“The peak observed at 1253 cm-1 can be assigned to the -COO (ester) group [61].”
Cheng 等 - 2019 - Extraction of Humic Acid from Lignite by KOH-Hydro DOI: 10.3390/app9071356 -
Acetate confianza 1,0
“A saturated absorption bands at 1253 (SO symmetry stretching) for AS cm(cid:1)1 (C-O-C”
A KBr-impregnated paper substrate as a sample probe for the enhanced ATR-FTIR signal strength of anionic and non-ionic surfactants in an aqueous medium DOI: 10.1039/d0ra07286a -
Acetate confianza 1,0
“cm-1 (O-H stretching vibration), 2915 cm-1 (-CH2), absorption peaks for CA were observed at 3285 cm-1 peaks for CA were observed at 3285 (O-H stretching vibration), 2915 (-CH 2), 1584 cm-1 cm-1 1584 cm-1 (C=O stretching vibration) [36], 125”
Liu 等 - 2018 - Highly Efficient Flame Retardant Hybrid Composites DOI: 10.3390/polym10060625 -
Carboxyl (COOH) confianza 1,0
“associated with the weak band at 1734 cm-1 due to aldehyde C = O stretching), 1321 cm-1, cm-1 cm-1, associated with the weak band at 1734 due to aldehyde C = O stretching), 1321 1253 cm-1 due to stretching of O-C of carboxylic acids and der”
Popa 等 - 2022 - Influence of Convective and Vacuum-Type Drying on DOI: 10.3390/molecules27134063 -
Thiocarbonyl confianza 1,0
“The absorption peaks are observed in the pure ligand at 1253 cm-1 and 802 cm-1 which can be related to the ν(C=S).”
Rogalewicz 等 - 2022 - Antitumor Activity and Physicochemical Properties DOI: 10.3390/molecules27092703 -
Fluorine (C-F) confianza 1,0
“A shoulder appearing at approximately 1265 cm-1 is due to the asymmetric vibration of the CF2 peak which was reported to be at 1253 cm-1[26].”
Fabrication of PECVD-grown fluorinated hydrocarbon nanoparticles and circular nanoring arrays using nanosphere lithography DOI: 10.1016/j.apsusc.2007.11.053
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