What absorbs at 911 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 911 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
Quick answer
A band near 911 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 |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Styrene | 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.
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 911 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
-
Alkyl C-H confianza 1,0
“These peaks represent C-H (PB).33,34 cm(cid:3)1 Another peak was observed around 911 bending of trans-alkene in polybutadiene wave number for the LP of CRMA interacted at 190-50 that represents the C-H bending of PB.34 At the aforementioned”
Effect of used motor oil as a rejuvenator on crumb rubber modifier’s released components to asphalt binder DOI: 10.1177/1477760620918600 -
Alkyl C-H confianza 1,0
“910a 914b P-O-(C) stretch/CH wagging 911 909 3 10071”
Gillens 和 Powell - 2013 - Rapid quantification of TBP and TBP degradation pr DOI: 10.1007/s10967-012-2147-6 -
confianza 1,0
“795.33cm(cid:2)1 (Si-O stretch) and absorption from trioctahedrals), 910.81cm(cid:2)1 (Al 2OH bending) shown in Fig.”
Ultrasonic extraction of arsenic and selenium from rocks associated with mountaintop removal/valley fills coal mining: Estimation of bioaccessible concentrations DOI: 10.1016/j.chemosphere.2010.01.020 -
Ammonium confianza 1,0
“In the present work, the spectral study of the solution UNIVERSITY 21 209 prepared using ammonium molybdate salt shows strong (broad and sharp) absorption bands at 911±2, 889±2 22 cm-1 cm-1 210 23 and 856±2 (Fig.”
Sen 等 - 2015 - Nanogram level quantification of molybdenum(VI) by DOI: 10.1039/C5AY01801C. -
Alkyl C-H confianza 1,0
“The last peaks (910.91 and cm-1) 877.69 correspond to a bending out of plane vibration =CH (aromatic ring).”
Belo 等 - 2018 - Development of a Black Liquor Electrolyzer for Lig DOI: 10.1149/08604.0003ecst -
Acetate confianza 1,0
“by the presence of C-O stretching at 911 Other characteristic IR bands can be”
Thermal and surface properties of hybrid materials obtained from epoxy-functional urethane and siloxane DOI: 10.1007/s00289-015-1545-7 -
C c single bond confianza 1,0
“u n cm-1 The wavenumbers separating normal tissue from meningioma are 911 (C-C stretching d e cm-1 cm-1 r ≈964”
Gajjar 等 - 2013 - Diagnostic segregation of human brain tumours usin DOI: 10.1039/C2AY25544H. -
confianza 1,0
“On the other hand, the weak negative band cm-1 at 911 was assigned to the C15-H and N-H HOOP vibrations of the original state of BR [35].”
Kawanabe 和 Kandori - 2009 - Photoreactions and Structural Changes of Anabaena DOI: 10.3390/s91209741
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