What absorbs at 1294 cm⁻¹ in an FTIR spectrum?
A band near 1294 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 1294 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 |
|---|---|---|---|
| Methacrylate | 7 | 5 | 1,0 |
| Acetate | 7 | 5 | 1,0 |
| Methoxy (OCH3) | 5 | 4 | 1,0 |
| C-O single bond | 5 | 4 | 1,0 |
| Amide | 3 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Ketone | 2 | 1 | 1,0 |
| Ester | 2 | 1 | 1,0 |
| Carbonyl (C=O) | 2 | 1 | 1,0 |
| Carboxyl (COOH) | 2 | 1 | 1,0 |
| Secondary amine | 2 | 1 | 1,0 |
| C n single bond | 2 | 1 | 1,0 |
| Aromatic ring | 2 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Sulfonyl | 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 |
|---|---|---|---|
| pMMA | 1294, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| TiO2 | 1294, 1700, 1093 | Methacrylate, Acetate, C-O single bond | 1 |
| PCL | 1294, 1751, 1724 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| cellulose | 1294, 1735, 1650 | Acetate, Methacrylate, 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 1294 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
“In this work, this band is related to a complex vibration, caused by overtones and combinations cm-1 of 1294 and 1400 bands due to the interacting C-O stretching and in-plane COH bending”
Kondratenko 等 - 2020 - Thioglycolic Acid FTIR Spectra on Ag2S Quantum Dot DOI: 10.3390/ma13040909 -
S eq o vertrouwen 1,0
“The bands at 1146 and 1294 cm-1 were recognized to be the stretching vibrations of S=O symmetric and S=O asymmetric, respectively.”
Preparation and Characterization of Polymer Membranes Impregnated with Carbon Nanotubes for Olive Mill Wastewater DOI: 10.3390/polym14030457 -
Aromatic ring vertrouwen 1,0
“stretching of benzene and thiophene ring (C-C-C) band at 1562 combination band cm-1 at 1294 that includes the asymmetrical stretching of benzene ring a(C-C-C), sym-”
Aguilar-Rodriguez 等 - 2023 - Microanalytical Characterization of an Innovative DOI: 10.3390/molecules28020564 -
Acetate vertrouwen 1,0
“C-O (ν a stretching band C-O) from 1294 cellulosechainsbymeansoftheairplasmatreatments.”
Alonso-Montemayor 等 - 2020 - Effect of cold air plasma on the morphology and th DOI: 10.24275/rmiq/Mat1510 -
Acetate vertrouwen 1,0
“The band at 1294 was associated with the stretching vibrations of C-O, and C-C bonds poly(ε-caprolactone).”
Hejna 等 - 2020 - Reclaimed RubberPoly(epsilon-caprolactone) Blends DOI: 10.3390/polym12051204 -
C-O single bond vertrouwen 1,0
“[87,94] PCL C-O/C-C stretching 1294 asymmetric C-O-C stretching 1240 asymmetric CH stretching”
Kravanja 和 Finsgar - 2021 - Analytical Techniques for the Characterization of DOI: 10.3390/biomedicines9121936 -
Metal oxygen vertrouwen 1,0
“surface.59 3(cid:2) to NO by the oxygen on Cr 2O Based on the 3 cm(cid:2)1) frequencies of the peaks (1294 and 1500 and previous surfaces,25,32,58-60,62,63 studies of nitrate ions on metal oxide (A S 0/S Changes in absorption spectra = log”
Nishino 和 Finlayson-Pitts - 2012 - Thermal and photochemical reactions of NO2 on chro DOI: 10.1039/c2cp42292a -
Amide vertrouwen 1,0
“at 718 (C=O bending), 1714 (C=O symmetric stretching), 1608, 1514, 1464, 1393 (C-C stretching of aromatic ring), 1393 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 1.00 (C-N stretching), 1294, 1025 (Ph-O-CH2), and 912 (oxirane (keV) ring) gave mo”
Rane 等 - 2014 - Synthesis and Characterization of Imide Containing DOI: 10.1155/2014/941793
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