What absorbs at 911 cm⁻¹ in an FTIR spectrum?
A band near 911 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Snel antwoord
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.
Mogelijke functionele-groeptoewijzingen
| Functionele groep | Ondersteunende feiten | Geciteerde bronnen | Hoogste vertrouwen |
|---|---|---|---|
| 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 |
Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.
Spectrumlogica
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.
Gebruik in de praktijk
Dit type query komt vaak voor bij polymeeridentificatie, screening van onbekende kunststoffen, probleemoplossing bij QC, verificatie van gerecycled materiaal en literatuurondersteunde beoordeling van piektoewijzing.
Veelgemaakte fouten
- Het behandelen van een enkele geïsoleerde band als bewijs van een materiaal zonder ten minste een of twee ondersteunende pieken te controleren.
- Overlap negeren: meerdere functionele groepen kunnen bijdragen rond hetzelfde golfgetal.
- Validatie overslaan wanneer additieven, mengsels, oxidatie of verontreiniging het spectrum kunnen verstoren.
Advies voor verificatie
Wanneer dubbelzinnigheid blijft bestaan, valideer de hypothese met DSC, GC-MS of TGA, vooral voor mengsels, gedegradeerde monsters en gevulde polymeren.
Literatuur achter deze toewijzingen
-
Alkyl C-H vertrouwen 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 vertrouwen 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 -
vertrouwen 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 vertrouwen 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 vertrouwen 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 vertrouwen 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 vertrouwen 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. -
vertrouwen 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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