What absorbs at 434 cm⁻¹ in an FTIR spectrum?
A band near 434 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 434 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 |
|---|---|---|---|
| Metal oxygen | 3 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.
Mogelijke materialen
| Materiaal | Ondersteunende pieken | Overlappende groepen | Geciteerde bronnen |
|---|---|---|---|
| iron oxide nanoparticles | 434, 2972, 528 | Metal oxygen, Acetate | 1 |
| MWCNT | 434, 2876, 1430 | Acetate | 1 |
Materialen worden alleen getoond wanneer dezelfde literatuurpool deze band en ten minste één extra karakteristieke piek ondersteunt.
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 434 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
-
Aromatic ring vertrouwen 1,0
“For the degradation of reactive violet (RV) 1 by the ligninolytic enzymes of the strain Ganoderma cupreum AG-1, the peaks at 1,602 and 1,434 cm-1 may be characteristics of C=C aromatic skeletal vibration and azo linkages (-N=N-) on aromatic”
Trichoderma asperellum laccase mediated crystal violet degradation–Optimization of experimental conditions and characterization DOI: 10.1016/j.jece.2016.11.044 -
Acetate vertrouwen 1,0
“For degradation ratios lower than 1 for stretching of C-O bonds (phytate 434 content, 0.90 ± 0.05) and stretching vibrations of C-O bonds (polysaccharides, 0.93 ± 0.03) were 435 observed.”
Valorisation of wheat bran to produce natural pigments using selected microorganisms DOI: 10.1016/j.carres.2013.08.015 -
vertrouwen 1,0
“Therefore, the dehydrogenation peak at 434 C is probably related to the decomposition of the unknown compounds, which can be denoted as "Li-Al-B-H".”
He 等 - 2019 - The Dehydrogenation Mechanism and Reversibility of DOI: 10.3390/met9050559 -
vertrouwen 1,0
“The peak at 434 cm-1 was assigned to the Zn-O stretching vibration, confirming the presence of ZnO in the composite Polymers2023,15,9”
Effect of Repeated Contact to Food Simulants on the Chemical and Functional Properties of Nano ZnO Composited LDPE Films for Reusable Food Packaging DOI: 10.3390/polym15010009 -
Silicon-oxygen (Si-O) vertrouwen 1,0
“The peak, centered 434 (νO-Si-O) identified by some peaks, centered at 520, 651 cm-1 at 1018 cm-1 slightly decreased.”
Radev 等 - 2009 - OrganicInorganic bioactive materials Part II in DOI: 10.2478/s11532-009-0076-1 -
Carbonyl (C=O) vertrouwen 1,0
“The carbonyl (C=O) group stretching cm-1 434 vibration appears at 1757 as a sharp peak (Fu et al., 2018;”
Influence of montmorillonite/carbon nanotube hybrid nanofillers on the properties of poly(lactic acid) DOI: 10.1016/j.clay.2020.105925 -
Silicon (Si) vertrouwen 1,0
“The band at 434 was attributed cm-1 to the Si-O the bending-rock mode.”
Zaid 等 - 2017 - Effect of Sintering on Crystallization and Structu DOI: 10.2298/SOS1704409Z -
Metal oxygen vertrouwen 0,9
“Text: 'two bands at 527 and 434 were observed for Fe-O'”
Khan 等 - 2022 - Biosynthesis and characterization of iron oxide na DOI: 10.3389/fpls.2022.1001499
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