What absorbs at 2148 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 2148 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 3 cited sources
Quick answer
A band near 2148 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 |
|---|---|---|---|
| Silicon hydride | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 0 | 0,9 |
La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.
Spectrum logic
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 2148 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatura detrás de estas asignaciones
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Silicon hydride confianza 1,0
“cm-1 ν to step-by-step building up procedure outlined above where DOD, and the 2140 involved solely the three DH, as cm-1 Si-H the particularly grouped species provided the best (Figures S12 and plus two shoulder peaks 2148 and 2159 cm-1 ag”
FTIR Measurement of the Hydrogenated Si(100) Surface: The Structure-Vibrational Interpretation by Means of Periodic DFT Calculation DOI: 10.1021/acs.jpcc.0c11176 -
Silicon hydride confianza 1,0
“LLM confirmed rule peak-group candidate”
The effect of alkyl chain length on the level of capping of silicon nanoparticles produced by a one-pot synthesis route based on the chemical reduction of micelle DOI: 10.1007/s11051-013-1425-8 -
confianza 1,0
“It is necessary to note that from nitrogen oxides only Creative surface debris with characteristic bands maxima at 2148 and nitrous oxide is well resolved while monoand dioxide are cm(cid:3)1 cm(cid:3)1 November 2097 (Fig.”
Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO2 catalyst DOI: 10.1039/c8ra07769j
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