What absorbs at 1145 cm⁻¹ in an FTIR spectrum?
A band near 1145 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 1145 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 |
|---|---|---|---|
| C-O single bond | 18 | 18 | 1,0 |
| Methoxy (OCH3) | 17 | 17 | 1,0 |
| Methacrylate | 17 | 17 | 1,0 |
| Acetate | 17 | 17 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| C n single bond | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Phospholipid | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Aromatic ring | 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 |
|---|---|---|---|
| PMMA | 1145, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 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 1145 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
“Zhou, Limin Wu, Polymer 122-129 4 C-O stretching vibrations 1145 (2011).”
Kumar 和 Sidhu - 2013 - Synthesis and Characterization of PMMA-ZrO2 Nanoco DOI: 10.1063/1.4810163 -
Amide vertrouwen 1,0
“stretching (1534 and 1381 C-O and C-N stretching (1145 and 1013 The RA-CPTMS/TiO composite 2 materials showed both characteristic peaks of TiO and the red amaranth extract, indicating the successful 2”
Kurniawan 等 - 2019 - Selective Betalain Impregnation from Red Amaranth DOI: 10.1063/1.5134613 -
Aromatic ring vertrouwen 1,0
“The 1145cm-1 1080cm-1 absorption peak at and corresponded to the benzene ring =C-H bending vibration 916cm-1 in the plane.”
Li 等 - 2011 - The detection of Cypermethrin on the surface of Ap DOI: 10.4028/www.scientific.net/AMR.287-290.2991 -
Acetate vertrouwen 1,0
“In the glycerol cm(cid:1)1 spectra, the peak intensities at about 1145 and 962 are responsible for C-O stretching [27].”
Interactions between polyols and wheat biopolymers in a bread model system fortified with inulin: A Fourier transform infrared study DOI: 10.1016/j.heliyon.2018. -
Phosphate (PO4) vertrouwen 1,0
“Peaks formed at 1145 cm-1 might also be due to the PO2 group vibration of the phospholipids present in the cold pressed walnut oil.”
Walnut Oil Oleogels as Milk Fat Replacing System for Commercially Available Chocolate Butter DOI: 10.3390/gels8100613 -
Acetate vertrouwen 1,0
“Three -C-O-Cpeaks appear at 1145, 1116, and cm-1, ular segments.”
Yang 等 - 2015 - Effect of molecular weight on conformational chang DOI: 10.1007/s10853-014-8714-1 -
Water (H2O) vertrouwen 1,0
“Therefore, the peak position at 1145 of between SO and water molecules are only slightly weaker 42V the band of SO may be related to MgSO gels present as than those between water molecules, the formation of SIPs (and”
Zhao 等 - 2006 - Magnesium sulfate aerosols studied by FTIR spectro DOI: 10.1021/jp055291i -
Amide vertrouwen 1,0
“[46], the peak at 1145 the amide band that accounts for the peak at 1236 cm-1[45].”
Antibacterial Activity of the Green Synthesized Plasmonic Silver Nanoparticles with Crystalline Structure against Gram-Positive and Gram-Negative Bacteria DOI: 10.3390/nano13081327
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