What absorbs at 1254 cm⁻¹ in an FTIR spectrum?
A band near 1254 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
Schnelle Antwort
A band near 1254 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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| C-O single bond | 7 | 7 | 1,0 |
| Alkyl C-H | 5 | 5 | 1,0 |
| Methoxy (OCH3) | 5 | 5 | 1,0 |
| Methacrylate | 5 | 5 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Hydrogen bond | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Mögliche Materialien
| Material | Unterstützende Peaks | Überlappende Gruppen | Zitierte Quellen |
|---|---|---|---|
| SiO2 | 1254, 1739, 699 | Alkyl C-H, Methoxy (OCH3) | 2 |
| PVC | 1254, 834, 1195 | Alkyl C-H, Methoxy (OCH3), Methacrylate | 2 |
| PMMA | 1254, 1722, 1383 | Methacrylate, Alkyl C-H, Methoxy (OCH3) | 1 |
| MgO | 1254, 699, 874 | Alkyl C-H, Methoxy (OCH3), Methacrylate | 1 |
| Polyurethane | 1254, 2270, 1700 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| SiO | 1254, 800, 1745 | Methacrylate, Methoxy (OCH3), C-O single bond | 1 |
Materialien werden nur angezeigt, wenn derselbe Literaturpool diese Bande und mindestens einen weiteren charakteristischen Peak unterstützt.
Spektrumslogik
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 1254 cm⁻¹ is usually not enough for material identification by itself.
Praktische Anwendung
Diese Art von Abfrage ist üblich bei der Polymeridentifikation, dem Screening unbekannter Kunststoffe, der Fehlersuche in der Qualitätskontrolle, der Verifizierung von Recyclingmaterial und der literaturgestützten Überprüfung der Peakzuordnung.
Häufige Fehler
- Behandlung einer isolierten Bande als Beweis für ein Material, ohne mindestens einen oder zwei unterstützende Peaks zu überprüfen.
- Überlappung ignorieren: Mehrere funktionelle Gruppen können nahe der gleichen Wellenzahl beitragen.
- Überspringen der Validierung, wenn Additive, Mischungen, Oxidation oder Verunreinigungen das Spektrum verfälschen können.
Beratung zur Verifizierung
Wenn weiterhin Mehrdeutigkeit besteht, validieren Sie die Hypothese mit DSC, GC-MS oder TGA, insbesondere bei Mischungen, degradierten Proben und gefüllten Polymeren.
Literatur hinter diesen Zuweisungen
-
Oxygen heterocycle Vertrauen 1,0
“at In addition, the bands revealed around 1254, 1070, and are Si-C, Si-O-C, related to and epoxy groups, respectively, of the glycidyoxypropylsilane [48].”
Alkali and epoxy-silane surface modified pine cone flour reinforced polypropylene/poly (lactic acid) DOI: 10.1080/01694243.2021.1952677 -
Vertrauen 1,0
“This corresponds to one of two overlapping cm-1 Val49 is near the lysine side chain (Figure 1), this result is in BR (Figure 3b), which was assigned bands at 1254 N-H 15-H consistent with an unchanged environment along the aliphatic to the”
Maeda 等 - 1999 - Chromophore-protein-water interactions in the L in DOI: 10.1021/bi9907072 -
Acetate Vertrauen 1,0
“The bands at 1254 is assigned to asymmetric vibration of C-O-C while cm-1 are indicating the presence of C-O-C (epoxy ring) vibration and C-Cl of the absorption peaks at 874 and 699”
Nor 等 - 2013 - Gas Permeability of ENRPVC Membrane with the Addi DOI: 10.1063/1.4858770 -
Alkyl C-H Vertrauen 1,0
“For PVC, C H stretching mode can be S.Rameshetal./SpectrochimicaActaPartA66(2007)1237-1242 1239 Table2 VibrationalmodesandwavenumbersexhibitedbyPMMA Wavenumbers(cm-1) Descriptionofvibrations References C Hstretching 2927-2986 [30,32] C Ostr”
Ramesh 等 - 2007 - FTIR studies of PVCPMMA blend based polymer elect DOI: 10.1016/j.saa.2006.06.012 -
Acetate Vertrauen 1,0
“Besides, the C-O-C stretching and deformation vibration were found at 1253.7 and 1123.7 cm-1, respectively, while peaks at 993.7, 772.8, 694.8, and 525.8 cm-1 were due to the C-H bending vibrations of polymer networks [30].”
Development of Biodegradable Agar-Agar/Gelatin-Based Superabsorbent Hydrogel as an Efficient Moisture-Retaining Agent DOI: 10.3390/biom10060939 -
Alkyl C-H Vertrauen 1,0
“On the other hand, the absorption peak located at 1254.49 cm-1 is due to the CH deformation in the bond Si-CH [39] Moreover, the peak intensity”
Cimavilla-Roman 等 - 2020 - Influence of silica aerogel particles on the foami DOI: 10.1016/j.eurpolymj.2020.109884 -
Acetate Vertrauen 1,0
“The peak at 1254 cm-1, associated with C-O stretching in lignin, is more without bleaching showed more surface irregularities.”
Characterization of Natural Fiber Extracted from Corn (Zea mays L.) Stalk Waste for Sustainable Development DOI: 10.3390/su142416605 -
Acetate Vertrauen 1,0
“bond elongation), from 1230 to cm-1 evolution curve in EGA-MS supports the TG/DTA results 1254 (C-O-C asymmetric stretching;”
Thermal decomposition of tris(O-ethyldithiocarbonato)-antimony(III)—a single-source precursor for antimony sulfide thin films DOI: 10.1007/s10973-021-10885-1
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