What absorbs at 949 cm⁻¹ in an FTIR spectrum?
A band near 949 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 949 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| C c single bond | 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 |
|---|---|---|---|
| Silica | 949, 1100, 1080 | Hydroxyl (O-H), Alkyl C-H, Methacrylate | 1 |
| CuO | 949, 453, 1000 | Hydroxyl (O-H), Methacrylate, Methoxy (OCH3) | 1 |
| silver nanoparticles | 949, 1636, 1631 | Hydroxyl (O-H), Alkyl C-H, Methacrylate | 1 |
| zeolite | 949, 1013, 1245 | Hydroxyl (O-H), Alkyl C-H | 1 |
| SiO2 | 949, 1739, 699 | Alkyl C-H, Hydroxyl (O-H), Methoxy (OCH3) | 1 |
| silica nanoparticles | 949, 1718, 2925 | Alkyl C-H, Hydroxyl (O-H), Methacrylate | 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 949 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
-
Silicon (Si) vertrouwen 1,0
“The weak bands at 900 cm-1 and 949 cm-1 are possibly atattributed to the symmetric stretching vibrations Si-OH and Si-O-Si in amorphous silica.”
Biosynthesized Silica Nanosuspension as Thermal Fluid in Parabolic Solar Panels DOI: 10.3390/e23020142 -
Alkene (C=C) vertrouwen 1,0
“stretching (1066 -CH-O-CHstretching (1003 and =C-H bending (949 cm-1) and = C-H bending (949 cm-1).”
Substantial Proton Ion Conduction in Methylcellulose/Pectin/Ammonium Chloride Based Solid Nanocomposite Polymer Electrolytes: Effect of ZnO Nanofiller DOI: 10.3390/membranes12070706 -
C c single bond vertrouwen 1,0
“Furthermore, the cm-1 band at 1081 and 1025 is assigned for the stretching of C-O-C group, however, C-C-H stretching, C-O-C glycosidic linkage (ring breathing), and -C-C (C-C-O ring) could be associated with the peak of 949, 887, and 814 cm”
Faried 等 - 2017 - Green Synthesis of Silver Nanoparticles in Biopoly DOI: 10.1063/1.4968377 -
Hydroxyl (O-H) vertrouwen 1,0
“2021, 68, 945-954 949 cm-1 at 1639.76 may be attributed to the bending vibration modes of O-H groups of these adsorbed H 2O molecules.49 Further, three small bands at 2862.62, 2928.94, cm-1 may be ascribed to the asymmetric and and 2959.97”
Shojaei 和 Komsari - 2021 - Synthesis of CuO by Electrospinning Method for Sen DOI: 10.17344/acsi.2021.6914 -
Alkyl C-H vertrouwen 1,0
“The band at 1470 cm-1 ones at 949 cm-1 cm-1 is representative of methylene deformation vibration and that at 2069 of a thiocyanate group.”
Thermocatalytic Pyrolysis of Exhausted Arthrospira platensis Biomass after Protein or Lipid Recovery DOI: 10.3390/en13205246 -
Hydroxyl (O-H) vertrouwen 1,0
“1619 stretching stretching 949 W-OH stretching O-H (%) O-W-O w2”
Surakasi 等 - 2022 - Methylene Blue Dye Photodegradation during Synthes DOI: 10.1155/2022/2882048 -
Silicon (Si) vertrouwen 1,0
“These 949cm-1 is assigned to the vibration of Si-OH.”
Van-Phuc Dinh 等 - 2021 - Fabrication of SiO2PEGDA Inverse Opal Photonic Cr DOI: 10.1155/2021/6613154 -
Acetate vertrouwen 1,0
“After epichlorohydrin-activation (including PEGDE cm-1 grafting), the spectrum of Cl-A LPEI shows a series of peaks at 1080 (C-O and C-C cm-1 cm-1 cm-1 stretching), 1055 (C-N stretching), 1001 (C-O-C stretching), 949 (epoxide cm-1 asymmetri”
Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III) DOI: 10.3390/polym13091513
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