What absorbs at 931 cm⁻¹ in an FTIR spectrum?
A band near 931 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 931 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 |
|---|---|---|---|
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 0,9 |
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 |
|---|---|---|---|
| sodium alginate | 931, 1636, 1080 | Methacrylate, C-O single bond, Acetate | 1 |
| curcumin | 931, 1063, 1153 | Methacrylate, Acetate, C-O single bond | 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 931 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
-
Phosphate (PO4) vertrouwen 1,0
“Same as 902 cm-1”
Effects of titanium nanoparticles on self-cleaning and structural features of zinc-magnesium-phosphate glass DOI: 10.1016/j.materresbull.2015.11.022 -
Phosphate (PO4) vertrouwen 1,0
“LLM confirmed rule peak-group candidate”
Ascolani Yael 等 - 2014 - Abiotic Degradation of Glyphosate into Aminomethyl DOI: 10.1021/jf502979d -
Ammonium vertrouwen 1,0
“of neat APP is associated with the appearance of the two intense peaks of ammonia at 966 and 931 decomposition of neat APP is associated with the appearance of the two intense peaks of ammonia In Figure 7, the intensities of these typical w”
Development of Bioepoxy Resin Microencapsulated Ammonium-Polyphosphate for Flame Retardancy of Polylactic Acid DOI: 10.3390/molecules24224123 -
Acetate vertrouwen 1,0
“cm-1 agar-specific The band at 931 corresponds to the C-O-O group present in the 3,6 -anhydrogalactose, and cm-1 the bands between 820 and 860 indicate the presence groups[53-57].”
Lima de Castro 等 - 2018 - Polysaccharides of red alga Gracilaria intermedia DOI: 10.1590/0104-1428.013116 -
Acetate vertrouwen 1,0
“3 ScientiFic REpoRTs | 7: | DOI:10.1038/s41598-017-13725-1 13254 www.nature.com/scientificreports/ (cm-1) Frequency Assignment Symmetric C-O stretching from ~931 carbohydrates”
Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy DOI: 10.1038/s41598-017-13725-1 -
Amide vertrouwen 1,0
“DNAandRNAribose stretching DNAandRNAribose-phosphatechain C-N+-Cstretching 931 vibrationofRNA DNAandRNAribose-phosphatechain C-N+-Cstretching 914”
Fourier-Transform Infrared Spectroscopy as a Discriminatory Tool for Myotonic Dystrophy Type 1 Metabolism: A Pilot Study DOI: 10.3390/ijerph18073800 -
Water (H2O) vertrouwen 1,0
“OeH and that are assigned to stretching vibrations of SieOHandAleAleOH,apeakat3371cm(cid:3)1correspondstoHeOeH 1627cm(cid:3)1 stretching vibrations of interlayer water, a peak at corHeOeH responds to bending mode of adsorbed water, peaks at”
Curcumin encapsulated dual cross linked sodium alginate/montmorillonite polymeric composite beads for controlled drug delivery DOI: 10.1016/j.jpha.2020.07.002 -
Acetate vertrouwen 1,0
“and the stretching vibration of the C-O-C appeared at 930.62 cm-1.”
Synthesis of Phosphated K-Carrageenan and Its Application for Flame-Retardant Waterborne Epoxy DOI: 10.3390/polym10111268
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