What absorbs at 2262 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 2262 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 2262 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 |
|---|---|---|---|
| N c o | 3 | 3 | 1,0 |
| Isocyanate | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.
Possible materials
| Material | Supporting peaks | Overlapping groups | Fuentes citadas |
|---|---|---|---|
| polyurethane | 2262, 2270, 1700 | N h | 2 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
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 2262 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
-
N c o confianza 1,0
“LLM confirmed rule peak-group candidate”
Preparation of one-shot and two-shot method of semi-rigid polyurethane film based on functionalized liquid natural rubber DOI: 10.1063/1.5047200 -
Isocyanate confianza 1,0
“cm-1 were visualized with the high-resolution Carl Zeiss The peak at wavenumber 2262 almost disappeared 300VP, working with Gemini SEM Technology and able due to the depletion of the isocyanate group (NCO) in the to detect a pressure of 150”
Ertugral - 2022 - Production and characterization of polyurethaneex DOI: 10.14314/polimery.2022.11.6 -
N c o confianza 1,0
“The signals at 31 ppm and 42 cm-1 The band at 2262 was associated to free -NCO HDICNW ppm in the spectra of were attributed to cm-1”
Haraguchi 等 - 2013 - Glycerol-derived polyurethane nanocomposites conta DOI: 10.4025/actascitechnol.v35i4.20276
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