What absorbs at 1290 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 1290 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 1290 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 |
|---|---|---|---|
| Amide | 13 | 11 | 1,0 |
| Secondary amine | 9 | 8 | 1,0 |
| C n single bond | 9 | 8 | 1,0 |
| Methacrylate | 9 | 7 | 1,0 |
| Acetate | 9 | 7 | 1,0 |
| Methoxy (OCH3) | 7 | 6 | 1,0 |
| C-O single bond | 7 | 6 | 1,0 |
| Alkyl C-H | 5 | 5 | 1,0 |
| Hydroxyl (O-H) | 5 | 5 | 1,0 |
| Ester | 4 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| S eq o | 2 | 2 | 1,0 |
| N-O bond | 2 | 2 | 1,0 |
| Ketone | 2 | 1 | 1,0 |
| Carboxyl (COOH) | 2 | 1 | 1,0 |
| Carbonyl (C=O) | 2 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Nitrate | 1 | 1 | 1,0 |
| Fluorine (C-F) | 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 |
|---|---|---|---|
| PVA | 1290, 1660, 2930 | Methacrylate, Amide | 1 |
| Polypyrrole | 1290, 1700, 400 | Amide, Secondary amine, C n single bond | 1 |
| polyaniline | 1290, 1565, 1570 | Amide, Secondary amine, C n single bond | 1 |
| copolymer | 1290, 2921, 1540 | Amide, Methacrylate | 1 |
| PLGA | 1290, 3200, 1741 | Methacrylate, Amide | 1 |
| polymer | 1290, 1718, 1722 | 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 1290 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
“-0(cid:5)6 movement of the anions was near at V, the two peaks cm-1 cm-1 The peaks at 1290 and 1025 were assigned were not symmetrical well due to the influence of backto in-plane C-H deformation and in-plane C-H stretchkinetics.27 From gro”
Structural and Electronic Property Study of Polypyrrole Nanowires Synthesized by Electrochemical Method DOI: 10.1166/nnl.2013.1514 -
Aromatic ring confianza 1,0
“1543 C C stretching in quinoid rings C stretching in quinoid rings 1290 C N stretching 1538 C 1447 C C stretching in benzoid rings 2996”
Dey Sadhu 等 - 2020 - Preparation and characterization of polyanilinea DOI: 10.1002/pc.25738 -
Nitrate confianza 1,0
“The peak at 1290 of NH The absence of any peaks for water is a distinguishing feature 3 indicative of monodentate nitrate species, disappears above 473 in this case that supports our mass spectroscopy data (not shown) cm-1,”
Pena 等 - 2004 - Identification of surface species on titania-suppo DOI: 10.1021/jp0313122 -
Ester confianza 1,0
“The degradation of the PS:PLA composites is reflected by a considerable decrease in the intensity of cm21) and -CH the ester group absorption band (1290 cm21) with simultaneous appearabsorption band (3000”
Shimpi 等 - 2014 - Preparation, Characterization, and Biodegradation DOI: 10.1002/pc.22658 -
Hydroxyl (O-H) confianza 1,0
“The PtNPs/GNs/PG electrode showed bands at 988 cm-1, 1290 cm-1, 1632 cm-1 and 3222 cm-1, which confirms O-H bonding, C-N stretching and N-H, as well as CThebareelectrodestudiedbySEMshowsnodeposition(Figure6A)ontoPGE,whereas cm-1, which was”
An Amperometric Acetylcholine Biosensor Based on Co-Immobilization of Enzyme Nanoparticles onto Nanocomposite DOI: 10.3390/bios13030386 -
Amide confianza 1,0
“C-N The vibrations at 1462 and 1290 cm-1 are generated because of stretching and C-Cl bond is responsible for the bands at 605 and 633 cm-1 bending vibrations, while the (M-O) Er2O3 has a metal-oxygen bond shown at 557 cm-1 [29].”
New Hybrid PVC/PVP Polymer Blend Modified with Er2O3 Nanoparticles for Optoelectronic Applications DOI: 10.3390/polym15030684 -
Amide confianza 1,0
“cm-1 [ν(N-H)], to the stretching vibration the band at 1637 cm-1 CO [ν(CO)], stretching vibration the band at 1569 to the quinonoid ring-stretching vibration, the bands at 1505 cm-1 to the benzenoid ring-stretching vibrations, the and 149”
Blaha 等 - 2019 - Role of p-Benzoquinone in the Synthesis of a Condu DOI: 10.1021/acsomega.9b00542 -
Hydroxyl (O-H) confianza 1,0
“cm(cid:1)1 cm(cid:1)1 cm(cid:1)1 The peak from 1290 of 3000 to 3500 to 1120 is due to the presence is indicative of hydroxyl group present -C-O -C Ciprofloxacin of symmetric and antisymmetric stretching of = O.”
Poly Lactic-Co-Glycolic Acid Nano-Carriers for Encapsulation and Controlled Release of Hydrophobic Drug to Enhance the Bioavailability and Antimicrobial Properties DOI: 10.1177/15593258231152117
¿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.