What absorbs at 2172 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 2172 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 5 cited sources
Quick answer
A band near 2172 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 | 1 | 1 | 1,0 |
| Bronsted acid site | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 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.
Possible materials
| Material | Supporting peaks | Overlapping groups | Fuentes citadas |
|---|---|---|---|
| CuO | 2172, 453, 1000 | Hydroxyl (O-H) | 1 |
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 2172 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
-
Water (H2O) confianza 1,0
“LLM confirmed rule peak-group candidate”
Suzuki 等 - 2008 - Structural Changes of Salinibacter Sensory Rhodops DOI: 10.1021/bi801358b -
Bronsted acid site confianza 1,0
“The high intensity of the band around 2172 ν Co2+-CO cm-1 in this sample in relation to the respective bands suggests an agglomeration of the Co2+ species that recreates Brønsted sites, i.e., not exchanged protons.”
Bellmann 等 - 2020 - Determining the Location of Co2+ in Zeolites by UV DOI: 10.3390/catal10010123 -
Silicon hydride confianza 1,0
“LLM confirmed rule peak-group candidate”
Colovic 等 - 2013 - Creating of Highly Active Calcium-Silicate Phases DOI: 10.2298/SOS1303341C -
confianza 0,9
“Stretching frequencies of CO adsorbed at most stable (110) ZnS: 2172 cm-1.”
Balantseva 等 - 2014 - Surface Properties of ZnS Nanoparticles A Combine DOI: 10.1021/jp507963y -
confianza 0,8
“Gas-phase CO characteristic peak.”
Wu Ying-Quan 等 - 2015 - Influence of Cu on the K-LaZrO2 Catalyst for Isobu DOI: 10.3866/PKU.
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