What absorbs at 1248 cm⁻¹ in an FTIR spectrum?
A band near 1248 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 1248 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) | 8 | 8 | 1,0 |
| Methacrylate | 8 | 8 | 1,0 |
| C-O single bond | 8 | 8 | 1,0 |
| Acetate | 8 | 8 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Lignin | 3 | 3 | 1,0 |
| N h | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Acetyl | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| Carbon bromine | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 0,9 |
| Sulfate (SO4) | 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 |
|---|---|---|---|
| Cellulose | 1248, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| DNA | 1248, 1712, 1660 | 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 1248 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
-
Acetate vertrouwen 1,0
“Our assignment of FTIR peaks 1248 C-O stretch (ether) of DGEBA (a)”
Probing deformation of double-walled carbon nanotube (DWNT)/epoxy composites using FTIR and Raman techniques DOI: 10.1016/j.compscitech.2010.04.025 -
Amide vertrouwen 1,0
“bution from the NH in-plane bending along with CN 23 cm-1 stretching), and 1248 (as a result of C-N-H in09:05 plane bending vibrations and CN stretching vibration) were assigned as amide II and III band (Kong at Figure 1.”
Changes in chemical composition and structure of root cell wall of citrus rootstock seedlings in response to boron deficiency by FTIR spectroscopy DOI: 10.1080/14620316.2017.1362327 -
Hydroxyl (O-H) vertrouwen 1,0
“The IR cm-1 band at 1248 is ascribed to the O-H bending vibrations.”
Gani 等 - 2017 - Physico-chemical, structural, pasting and thermal DOI: 10.1016/j.ijbiomac.2016.10.100 -
Phosphate (PO4) vertrouwen 1,0
“The peak at 1248 was ascribed to phosphate reticulata Lindl.”
Han 等 - 2018 - Insight into Rapid DNA-Specific Identification of DOI: 10.3390/molecules23112842 -
Acetate vertrouwen 1,0
“The peak for C-O-C (1248 cm-1 ascribable to the deformation of the C-H rocking Meanwhile, the peaks at 1161.72, 1104.35, and 1094.86”
Characterization of cellulose extracted from oil palm empty fruit bunch DOI: 10.1063/1.4931295 -
Ester vertrouwen 1,0
“Explicitly assigned to ester group vibrations.”
Biowaxes from Palm Oil as Promising Candidates for Cosmetic Matrices and Pharmaceuticals for Human Use DOI: 10.3390/ma16124402 -
Lignin vertrouwen 1,0
“Also being noted, decrease of peaks close to close to lignin (1505 and 1597 cm-1) and hemicellulose (1737 and 1248 cm-1) [15,31].”
Combined Treatment (Alkali + Thermal) of Calotropis procera Fiber for Removal of Petroleum Hydrocarbons in Cases of Oil Spill DOI: 10.3390/polym13193285 -
Carbohydrate vertrouwen 1,0
“The second LDA axis explained 31.3 % of the variation and segregated the samples mainly according to the ATR-FTIR spectrum peak at 1737 cm-1 connected with lipids, peaks at 1173 and 1248 cm-1 corresponded with carbohydrates and”
Highly Efficient Use of Infrared Spectroscopy (ATR-FTIR) to Identify Aphid Species DOI: 10.3390/biology11081232
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