What absorbs at 2140 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 2140 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 2140 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Adsorbed carbon monoxide | 2 | 1 | 1,0 |
| C#c | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Silicon hydride | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 0 | 1,0 |
| Nitrile | 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 |
|---|---|---|---|
| AgNPs | 2140, 1232, 1048 | Hydroxyl (O-H) | 1 |
| silver nanoparticles | 2140, 1636, 1631 | Hydroxyl (O-H) | 1 |
| zeolite | 2140, 1013, 1245 | Hydroxyl (O-H), Adsorbed carbon monoxide | 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 2140 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
-
Hydroxyl (O-H) confianza 1,0
“N-D identified that the stretching vibrations of the Schiff X-D most spectral changes in the stretching vibrations cm-1 (32) base in BR and ppR are located at 2171 and 2123 O-D N-D originate from either a water stretch or a stretch cm-1 and”
Ota 等 - 2006 - Structural changes in the Schiff base region of sq DOI: 10.1021/bi051937l -
Hydroxyl (O-H) confianza 1,0
“Physisorbed CO results in a band at 2140 cm-1, whereas CO interacting with surface OH groups gives rise to a band at 2155 while cm-1 cm-1 another massif from 2180 to 2245 accounts for CO interacting with Lewis cm-1”
Upgrading the PtCu intermetallic compounds: The role of Pt and Cu in the alloy DOI: 10.1016/j.cattod.2019.11.026 -
Silicon hydride confianza 1,0
“Whereas the decrease in the CH bands intensities and the simultaneous 3 cm-1 increase of the Si-H absorption band intensity at 2140 at higher W/F values (hard plasma conditions), is due to the higher monomer fragmentation.”
Comparative study of bulk and surface compositions of plasma polymerized organosilicon thin films DOI: 10.1002/ppap.201900024. -
Hydroxyl (O-H) confianza 1,0
“cm-1 and interaction with Here, the strong broadband centered at around 3291 and weak band at cm-1 around 2140 are ascribed to the inter molecular hydrogen bonded network formed by the hydroxyl groups”
Bioinspired 5-caffeoylquinic acid capped silver nanoparticles using Coffee arabica leaf extract for high-sensitive cysteine detection DOI: 10.1038/s41598-023-34944-9 -
confianza 1,0
“Based on our previous studies supported by DFT calculations [8,11], we assign the cm-1 2127 band to Pd(II)(OH)(CO) complex (or alternatively Pd(II)(CO) complex: we cannot cm-1 exclude either assignment at present) and the 2140 band to a dif”
The superior hydrothermal stability of Pd/SSZ-39 in low temperature passive NOx adsorption (PNA) and methane combustion DOI: 10.1016/j.jcat.2010.07.031. -
C c single bond confianza 1,0
“LLM confirmed rule peak-group candidate”
Microsoft Word - Rapid_synthesis_of_nanocrystalline_YAG_via_microwave_assisted_solvothermal_process_final_resubmit_jbBV (1) DOI: 10.1111/jace.15815 -
Adsorbed carbon monoxide confianza 1,0
“cm-1, bands of carbon dioxide at 2317 and 3728 cm-1, the rotovibrational band due to CO deformation at bands of carbon dioxide at 2317 and 3728 the rotovibrational band due to CO deformation at 2 2 cm-1, cm-1), 771 the rotovibrational band”
Thermocatalytic Pyrolysis of Exhausted Arthrospira platensis Biomass after Protein or Lipid Recovery DOI: 10.3390/en13205246 -
C#c confianza 1,0
“Also, a small stretch at 2140 was found, which can be assigned to alkyne Apart cm-1 from this, a very sharp and intense peak was obtained at 1650 for C=O stretch representing α, β unsaturated cm-1 aldehydes and ketones.”
Comparative assessment of green and chemically synthesized glutathione capped silver nanoparticles for antioxidant, mosquito larvicidal and eco-toxicological activities DOI: 10.1038/s41598-023-35249-7
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